diff --git a/backend/apps/materials/serializers.py b/backend/apps/materials/serializers.py
index 6b0cf7a..3d7fd3d 100644
--- a/backend/apps/materials/serializers.py
+++ b/backend/apps/materials/serializers.py
@@ -183,6 +183,7 @@ class StockTransactionSerializer(serializers.ModelSerializer):
         source='get_transaction_type_display',
         read_only=True,
     )
+    is_locked = serializers.SerializerMethodField()
 
     class Meta:
         model = StockTransaction
@@ -199,10 +200,15 @@ class StockTransactionSerializer(serializers.ModelSerializer):
             'occurred_on',
             'note',
             'fertilization_plan',
+            'spreading_item',
+            'is_locked',
             'created_at',
         ]
         read_only_fields = ['created_at']
 
+    def get_is_locked(self, obj):
+        return bool(obj.fertilization_plan_id or obj.spreading_item_id)
+
 
 class StockSummarySerializer(serializers.Serializer):
     material_id = serializers.IntegerField()
diff --git a/backend/apps/materials/views.py b/backend/apps/materials/views.py
index 1106872..e462cc7 100644
--- a/backend/apps/materials/views.py
+++ b/backend/apps/materials/views.py
@@ -54,7 +54,7 @@ class StockTransactionViewSet(viewsets.ModelViewSet):
 
     serializer_class = StockTransactionSerializer
     permission_classes = [IsAuthenticated]
-    http_method_names = ['get', 'post', 'delete', 'head', 'options']
+    http_method_names = ['get', 'post', 'put', 'patch', 'delete', 'head', 'options']
 
     def get_queryset(self):
         queryset = StockTransaction.objects.select_related('material')
@@ -77,6 +77,33 @@ class StockTransactionViewSet(viewsets.ModelViewSet):
 
         return queryset
 
+    def update(self, request, *args, **kwargs):
+        instance = self.get_object()
+        if instance.fertilization_plan_id or instance.spreading_item_id:
+            return Response(
+                {'detail': '計画や実績に紐づく入出庫履歴は編集できません。'},
+                status=status.HTTP_400_BAD_REQUEST,
+            )
+        return super().update(request, *args, **kwargs)
+
+    def partial_update(self, request, *args, **kwargs):
+        instance = self.get_object()
+        if instance.fertilization_plan_id or instance.spreading_item_id:
+            return Response(
+                {'detail': '計画や実績に紐づく入出庫履歴は編集できません。'},
+                status=status.HTTP_400_BAD_REQUEST,
+            )
+        return super().partial_update(request, *args, **kwargs)
+
+    def destroy(self, request, *args, **kwargs):
+        instance = self.get_object()
+        if instance.fertilization_plan_id or instance.spreading_item_id:
+            return Response(
+                {'detail': '計画や実績に紐づく入出庫履歴は削除できません。'},
+                status=status.HTTP_400_BAD_REQUEST,
+            )
+        return super().destroy(request, *args, **kwargs)
+
 
 class StockSummaryView(generics.ListAPIView):
     """在庫集計一覧"""
diff --git a/frontend/src/app/allocation/page.tsx b/frontend/src/app/allocation/page.tsx
index 5d5f216..0a7cab5 100644
--- a/frontend/src/app/allocation/page.tsx
+++ b/frontend/src/app/allocation/page.tsx
@@ -2,7 +2,7 @@
 
 import { useState, useEffect, useMemo } from 'react';
 import { api } from '@/lib/api';
-import { Field, Crop, Material, Plan } from '@/types';
+import { Field, Crop, Plan } from '@/types';
 import Navbar from '@/components/Navbar';
 import { Menu, X, BarChart3, ChevronRight, ChevronDown, ArrowUp, ArrowDown, Copy, Settings, Trash2, CheckSquare, Search } from 'lucide-react';
 
@@ -23,7 +23,6 @@ export default function AllocationPage() {
   const [fields, setFields] = useState<Field[]>([]);
   const [crops, setCrops] = useState<Crop[]>([]);
   const [plans, setPlans] = useState<Plan[]>([]);
-  const [seedMaterials, setSeedMaterials] = useState<Material[]>([]);
   const [year, setYear] = useState<number>(() => {
     if (typeof window !== 'undefined') {
       const saved = localStorage.getItem('allocationYear');
@@ -61,16 +60,14 @@ export default function AllocationPage() {
   const fetchData = async (background = false) => {
     if (!background) setLoading(true);
     try {
-      const [fieldsRes, cropsRes, plansRes, seedMaterialsRes] = await Promise.all([
+      const [fieldsRes, cropsRes, plansRes] = await Promise.all([
         api.get('/fields/?ordering=group_name,display_order,id'),
         api.get('/plans/crops/'),
         api.get(`/plans/?year=${year}`),
-        api.get('/materials/materials/?material_type=seed'),
       ]);
       setFields(fieldsRes.data);
       setCrops(cropsRes.data);
       setPlans(plansRes.data);
-      setSeedMaterials(seedMaterialsRes.data);
     } catch (error) {
       console.error('Failed to fetch data:', error);
     } finally {
@@ -384,20 +381,6 @@ export default function AllocationPage() {
     }
   };
 
-  const handleUpdateVarietySeedMaterial = async (varietyId: number, seedMaterialId: string) => {
-    try {
-      const variety = crops.flatMap((crop) => crop.varieties).find((item) => item.id === varietyId);
-      if (!variety) return;
-      await api.patch(`/plans/varieties/${varietyId}/`, {
-        seed_material: seedMaterialId ? parseInt(seedMaterialId, 10) : null,
-      });
-      await fetchData(true);
-    } catch (error) {
-      console.error('Failed to update variety seed material:', error);
-      alert('種子在庫の紐付け更新に失敗しました');
-    }
-  };
-
   const toggleFieldSelection = (fieldId: number) => {
     setSelectedFields((prev) => {
       const next = new Set(prev);
@@ -1079,15 +1062,6 @@ export default function AllocationPage() {
                         initialValue={v.default_seedling_boxes_per_tan}
                         onSave={handleUpdateVarietyDefaultBoxes}
                       />
-                      <div className="mt-3">
-                        <VarietySeedMaterialForm
-                          varietyId={v.id}
-                          initialValue={v.seed_material ? String(v.seed_material) : ''}
-                          initialLabel={v.seed_material_name}
-                          materials={seedMaterials}
-                          onSave={handleUpdateVarietySeedMaterial}
-                        />
-                      </div>
                     </li>
                   ))}
                 </ul>
@@ -1196,60 +1170,3 @@ function VarietyDefaultBoxesForm({
     </div>
   );
 }
-
-function VarietySeedMaterialForm({
-  varietyId,
-  initialValue,
-  initialLabel,
-  materials,
-  onSave,
-}: {
-  varietyId: number;
-  initialValue: string;
-  initialLabel: string | null;
-  materials: Material[];
-  onSave: (varietyId: number, seedMaterialId: string) => Promise<void>;
-}) {
-  const [value, setValue] = useState(initialValue);
-  const [saving, setSaving] = useState(false);
-
-  useEffect(() => {
-    setValue(initialValue);
-  }, [initialValue]);
-
-  const handleSave = async () => {
-    setSaving(true);
-    await onSave(varietyId, value);
-    setSaving(false);
-  };
-
-  return (
-    <div className="flex items-end gap-2">
-      <div className="flex-1">
-        <label className="mb-1 block text-xs text-gray-600">種子在庫資材</label>
-        <select
-          value={value}
-          onChange={(e) => setValue(e.target.value)}
-          className="w-full rounded-md border border-gray-300 px-3 py-2 text-sm focus:outline-none focus:ring-2 focus:ring-green-500"
-        >
-          <option value="">未設定</option>
-          {materials.map((material) => (
-            <option key={material.id} value={material.id}>
-              {material.name}
-            </option>
-          ))}
-        </select>
-        <p className="mt-1 text-xs text-gray-500">
-          現在: {initialLabel || '未設定'}
-        </p>
-      </div>
-      <button
-        onClick={handleSave}
-        disabled={saving}
-        className="rounded-md bg-green-600 px-3 py-2 text-sm text-white hover:bg-green-700 disabled:opacity-50"
-      >
-        保存
-      </button>
-    </div>
-  );
-}
diff --git a/frontend/src/app/materials/_components/MaterialForm.tsx b/frontend/src/app/materials/_components/MaterialForm.tsx
index 12c4fdb..072b6de 100644
--- a/frontend/src/app/materials/_components/MaterialForm.tsx
+++ b/frontend/src/app/materials/_components/MaterialForm.tsx
@@ -9,6 +9,7 @@ export type MaterialTab = 'fertilizer' | 'pesticide' | 'seed' | 'misc';
 export interface MaterialFormState {
   name: string;
   material_type: Material['material_type'];
+  seed_variety_id: string;
   maker: string;
   stock_unit: Material['stock_unit'];
   is_active: boolean;
@@ -33,6 +34,7 @@ interface MaterialFormProps {
   tab: MaterialTab;
   form: MaterialFormState;
   saving: boolean;
+  seedVarietyOptions?: { id: number; label: string }[];
   onBaseFieldChange: (
     field: keyof Omit<MaterialFormState, 'fertilizer_profile' | 'pesticide_profile'>,
     value: string | boolean
@@ -56,6 +58,7 @@ export default function MaterialForm({
   tab,
   form,
   saving,
+  seedVarietyOptions = [],
   onBaseFieldChange,
   onFertilizerFieldChange,
   onPesticideFieldChange,
@@ -245,9 +248,18 @@ export default function MaterialForm({
       </td>
       <td className="px-2 py-2">
         {tab === 'seed' ? (
-          <div className="rounded-md border border-green-200 bg-green-100 px-2 py-1 text-sm text-green-800">
-            種子
-          </div>
+          <select
+            className={inputClassName}
+            value={form.seed_variety_id}
+            onChange={(e) => onBaseFieldChange('seed_variety_id', e.target.value)}
+          >
+            <option value="">品種未設定</option>
+            {seedVarietyOptions.map((option) => (
+              <option key={option.id} value={option.id}>
+                {option.label}
+              </option>
+            ))}
+          </select>
         ) : (
           <select
             className={inputClassName}
diff --git a/frontend/src/app/materials/_components/StockOverview.tsx b/frontend/src/app/materials/_components/StockOverview.tsx
index 61a9d41..b4aca8d 100644
--- a/frontend/src/app/materials/_components/StockOverview.tsx
+++ b/frontend/src/app/materials/_components/StockOverview.tsx
@@ -1,7 +1,7 @@
 'use client';
 
 import { Fragment } from 'react';
-import { Clock3, Download, Upload } from 'lucide-react';
+import { Clock3, Download, Pencil, Trash2, Upload } from 'lucide-react';
 
 import { StockSummary, StockTransaction } from '@/types';
 
@@ -15,6 +15,8 @@ interface StockOverviewProps {
     materialId: number,
     transactionType: StockTransaction['transaction_type']
   ) => void;
+  onEditTransaction: (transaction: StockTransaction) => void;
+  onDeleteTransaction: (transaction: StockTransaction) => void;
   onToggleHistory: (materialId: number) => void;
 }
 
@@ -25,6 +27,8 @@ export default function StockOverview({
   historyLoadingId,
   histories,
   onOpenTransaction,
+  onEditTransaction,
+  onDeleteTransaction,
   onToggleHistory,
 }: StockOverviewProps) {
   if (loading) {
@@ -149,6 +153,24 @@ export default function StockOverview({
                                 <span className="text-gray-500">
                                   {transaction.note || '備考なし'}
                                 </span>
+                                <div className="flex items-center gap-2">
+                                  <button
+                                    onClick={() => onEditTransaction(transaction)}
+                                    disabled={transaction.is_locked}
+                                    className="inline-flex items-center gap-1 rounded border border-blue-300 px-2 py-1 text-xs text-blue-700 hover:bg-blue-50 disabled:cursor-not-allowed disabled:opacity-40"
+                                  >
+                                    <Pencil className="h-3 w-3" />
+                                    編集
+                                  </button>
+                                  <button
+                                    onClick={() => onDeleteTransaction(transaction)}
+                                    disabled={transaction.is_locked}
+                                    className="inline-flex items-center gap-1 rounded border border-red-300 px-2 py-1 text-xs text-red-600 hover:bg-red-50 disabled:cursor-not-allowed disabled:opacity-40"
+                                  >
+                                    <Trash2 className="h-3 w-3" />
+                                    削除
+                                  </button>
+                                </div>
                               </div>
                             ))}
                           </div>
diff --git a/frontend/src/app/materials/_components/StockTransactionForm.tsx b/frontend/src/app/materials/_components/StockTransactionForm.tsx
index 839c589..5294d76 100644
--- a/frontend/src/app/materials/_components/StockTransactionForm.tsx
+++ b/frontend/src/app/materials/_components/StockTransactionForm.tsx
@@ -13,6 +13,7 @@ interface StockTransactionFormProps {
   materials: Material[];
   presetMaterialId?: number | null;
   presetTransactionType?: TransactionType | null;
+  editingTransaction?: StockTransaction | null;
   onClose: () => void;
   onSaved: () => Promise<void> | void;
 }
@@ -32,6 +33,7 @@ export default function StockTransactionForm({
   materials,
   presetMaterialId = null,
   presetTransactionType = null,
+  editingTransaction = null,
   onClose,
   onSaved,
 }: StockTransactionFormProps) {
@@ -47,13 +49,21 @@ export default function StockTransactionForm({
     if (!isOpen) {
       return;
     }
-    setMaterialId(presetMaterialId ? String(presetMaterialId) : '');
-    setTransactionType(presetTransactionType ?? 'purchase');
-    setQuantity('');
-    setOccurredOn(today());
-    setNote('');
+    if (editingTransaction) {
+      setMaterialId(String(editingTransaction.material));
+      setTransactionType(editingTransaction.transaction_type);
+      setQuantity(editingTransaction.quantity);
+      setOccurredOn(editingTransaction.occurred_on);
+      setNote(editingTransaction.note || '');
+    } else {
+      setMaterialId(presetMaterialId ? String(presetMaterialId) : '');
+      setTransactionType(presetTransactionType ?? 'purchase');
+      setQuantity('');
+      setOccurredOn(today());
+      setNote('');
+    }
     setError(null);
-  }, [isOpen, presetMaterialId, presetTransactionType]);
+  }, [isOpen, presetMaterialId, presetTransactionType, editingTransaction]);
 
   if (!isOpen) {
     return null;
@@ -73,13 +83,18 @@ export default function StockTransactionForm({
 
     setSaving(true);
     try {
-      await api.post('/materials/stock-transactions/', {
+      const payload = {
         material: Number(materialId),
         transaction_type: transactionType,
         quantity,
         occurred_on: occurredOn,
         note,
-      });
+      };
+      if (editingTransaction) {
+        await api.put(`/materials/stock-transactions/${editingTransaction.id}/`, payload);
+      } else {
+        await api.post('/materials/stock-transactions/', payload);
+      }
       await onSaved();
       onClose();
     } catch (e: unknown) {
@@ -104,7 +119,9 @@ export default function StockTransactionForm({
         <div className="flex items-center justify-between border-b border-gray-200 px-6 py-4">
           <div>
             <h2 className="text-lg font-semibold text-gray-900">入出庫登録</h2>
-            <p className="text-sm text-gray-500">在庫の増減を記録します。</p>
+            <p className="text-sm text-gray-500">
+              {editingTransaction ? '入出庫履歴を修正します。' : '在庫の増減を記録します。'}
+            </p>
           </div>
           <button
             onClick={onClose}
diff --git a/frontend/src/app/materials/masters/page.tsx b/frontend/src/app/materials/masters/page.tsx
index 39edc26..b9dbd40 100644
--- a/frontend/src/app/materials/masters/page.tsx
+++ b/frontend/src/app/materials/masters/page.tsx
@@ -10,7 +10,7 @@ import MaterialForm, {
 } from '../_components/MaterialForm';
 import Navbar from '@/components/Navbar';
 import { api } from '@/lib/api';
-import { Material } from '@/types';
+import { Crop, Material } from '@/types';
 
 const tabs: { key: MaterialTab; label: string }[] = [
   { key: 'fertilizer', label: '肥料' },
@@ -29,9 +29,16 @@ const emptyForm = (tab: MaterialTab): MaterialFormState => ({
         : tab === 'seed'
           ? 'seed'
           : 'other',
+  seed_variety_id: '',
   maker: '',
   stock_unit:
-    tab === 'fertilizer' ? 'bag' : tab === 'pesticide' ? 'bottle' : tab === 'seed' ? 'kg' : 'piece',
+    tab === 'fertilizer'
+      ? 'bag'
+      : tab === 'pesticide'
+        ? 'bottle'
+        : tab === 'seed'
+          ? 'kg'
+          : 'piece',
   is_active: true,
   notes: '',
   fertilizer_profile: {
@@ -50,10 +57,13 @@ const emptyForm = (tab: MaterialTab): MaterialFormState => ({
   },
 });
 
+type VarietyOption = { id: number; label: string };
+
 export default function MaterialMastersPage() {
   const router = useRouter();
   const [tab, setTab] = useState<MaterialTab>('fertilizer');
   const [materials, setMaterials] = useState<Material[]>([]);
+  const [crops, setCrops] = useState<Crop[]>([]);
   const [loading, setLoading] = useState(true);
   const [editingId, setEditingId] = useState<number | 'new' | null>(null);
   const [form, setForm] = useState<MaterialFormState>(emptyForm('fertilizer'));
@@ -61,7 +71,7 @@ export default function MaterialMastersPage() {
   const [error, setError] = useState<string | null>(null);
 
   useEffect(() => {
-    fetchMaterials();
+    fetchData();
   }, []);
 
   useEffect(() => {
@@ -70,11 +80,15 @@ export default function MaterialMastersPage() {
     }
   }, [tab, editingId]);
 
-  const fetchMaterials = async () => {
+  const fetchData = async () => {
     setLoading(true);
     try {
-      const res = await api.get('/materials/materials/');
-      setMaterials(res.data);
+      const [materialsRes, cropsRes] = await Promise.all([
+        api.get('/materials/materials/'),
+        api.get('/plans/crops/'),
+      ]);
+      setMaterials(materialsRes.data);
+      setCrops(cropsRes.data);
     } catch (e) {
       console.error(e);
       setError('資材マスタの取得に失敗しました。');
@@ -83,6 +97,26 @@ export default function MaterialMastersPage() {
     }
   };
 
+  const allVarieties = crops.flatMap((crop) =>
+    crop.varieties.map((variety) => ({
+      ...variety,
+      crop_name: crop.name,
+    }))
+  );
+
+  const seedVarietyOptions: VarietyOption[] = allVarieties.map((variety) => ({
+    id: variety.id,
+    label: `${variety.crop_name} / ${variety.name}`,
+  }));
+
+  const getLinkedVariety = (materialId: number) =>
+    allVarieties.find((variety) => variety.seed_material === materialId) ?? null;
+
+  const getLinkedVarietyLabel = (materialId: number) => {
+    const variety = getLinkedVariety(materialId);
+    return variety ? `${variety.crop_name} / ${variety.name}` : '-';
+  };
+
   const visibleMaterials = materials.filter((material) => {
     if (tab === 'misc') {
       return material.material_type === 'other' || material.material_type === 'seedling';
@@ -98,9 +132,11 @@ export default function MaterialMastersPage() {
 
   const startEdit = (material: Material) => {
     setError(null);
+    const linkedVariety = getLinkedVariety(material.id);
     setForm({
       name: material.name,
       material_type: material.material_type,
+      seed_variety_id: linkedVariety ? String(linkedVariety.id) : '',
       maker: material.maker,
       stock_unit: material.stock_unit,
       is_active: material.is_active,
@@ -128,6 +164,23 @@ export default function MaterialMastersPage() {
     setForm(emptyForm(tab));
   };
 
+  const syncSeedVariety = async (materialId: number, seedVarietyId: string) => {
+    const currentlyLinked = getLinkedVariety(materialId);
+    const selectedVarietyId = seedVarietyId ? parseInt(seedVarietyId, 10) : null;
+
+    if (currentlyLinked && currentlyLinked.id !== selectedVarietyId) {
+      await api.patch(`/plans/varieties/${currentlyLinked.id}/`, {
+        seed_material: null,
+      });
+    }
+
+    if (selectedVarietyId) {
+      await api.patch(`/plans/varieties/${selectedVarietyId}/`, {
+        seed_material: materialId,
+      });
+    }
+  };
+
   const handleSave = async () => {
     setError(null);
 
@@ -167,13 +220,27 @@ export default function MaterialMastersPage() {
             : undefined,
       };
 
+      let savedMaterial: Material;
       if (editingId === 'new') {
-        await api.post('/materials/materials/', payload);
+        const res = await api.post('/materials/materials/', payload);
+        savedMaterial = res.data;
       } else {
-        await api.put(`/materials/materials/${editingId}/`, payload);
+        const res = await api.put(`/materials/materials/${editingId}/`, payload);
+        savedMaterial = res.data;
       }
 
-      await fetchMaterials();
+      if (form.material_type === 'seed') {
+        await syncSeedVariety(savedMaterial.id, form.seed_variety_id);
+      } else {
+        const linkedVariety = getLinkedVariety(savedMaterial.id);
+        if (linkedVariety) {
+          await api.patch(`/plans/varieties/${linkedVariety.id}/`, {
+            seed_material: null,
+          });
+        }
+      }
+
+      await fetchData();
       setEditingId(null);
       setForm(emptyForm(tab));
     } catch (e: unknown) {
@@ -197,7 +264,7 @@ export default function MaterialMastersPage() {
     setError(null);
     try {
       await api.delete(`/materials/materials/${material.id}/`);
-      await fetchMaterials();
+      await fetchData();
     } catch (e: unknown) {
       console.error(e);
       const detail =
@@ -249,6 +316,22 @@ export default function MaterialMastersPage() {
     }));
   };
 
+  const tableProps = {
+    materials: visibleMaterials,
+    editingId,
+    form,
+    saving,
+    seedVarietyOptions,
+    getLinkedVarietyLabel,
+    onEdit: startEdit,
+    onDelete: handleDelete,
+    onBaseFieldChange: handleBaseFieldChange,
+    onFertilizerFieldChange: handleFertilizerFieldChange,
+    onPesticideFieldChange: handlePesticideFieldChange,
+    onSave: handleSave,
+    onCancel: cancelEdit,
+  };
+
   return (
     <div className="min-h-screen bg-gray-50">
       <Navbar />
@@ -312,66 +395,10 @@ export default function MaterialMastersPage() {
           <p className="text-sm text-gray-500">読み込み中...</p>
         ) : (
           <div className="overflow-x-auto rounded-2xl border border-gray-200 bg-white shadow-sm">
-            {tab === 'fertilizer' && (
-              <FertilizerTable
-                materials={visibleMaterials}
-                editingId={editingId}
-                form={form}
-                saving={saving}
-                onEdit={startEdit}
-                onDelete={handleDelete}
-                onBaseFieldChange={handleBaseFieldChange}
-                onFertilizerFieldChange={handleFertilizerFieldChange}
-                onPesticideFieldChange={handlePesticideFieldChange}
-                onSave={handleSave}
-                onCancel={cancelEdit}
-              />
-            )}
-            {tab === 'pesticide' && (
-              <PesticideTable
-                materials={visibleMaterials}
-                editingId={editingId}
-                form={form}
-                saving={saving}
-                onEdit={startEdit}
-                onDelete={handleDelete}
-                onBaseFieldChange={handleBaseFieldChange}
-                onFertilizerFieldChange={handleFertilizerFieldChange}
-                onPesticideFieldChange={handlePesticideFieldChange}
-                onSave={handleSave}
-                onCancel={cancelEdit}
-              />
-            )}
-            {tab === 'seed' && (
-              <SeedTable
-                materials={visibleMaterials}
-                editingId={editingId}
-                form={form}
-                saving={saving}
-                onEdit={startEdit}
-                onDelete={handleDelete}
-                onBaseFieldChange={handleBaseFieldChange}
-                onFertilizerFieldChange={handleFertilizerFieldChange}
-                onPesticideFieldChange={handlePesticideFieldChange}
-                onSave={handleSave}
-                onCancel={cancelEdit}
-              />
-            )}
-            {tab === 'misc' && (
-              <MiscTable
-                materials={visibleMaterials}
-                editingId={editingId}
-                form={form}
-                saving={saving}
-                onEdit={startEdit}
-                onDelete={handleDelete}
-                onBaseFieldChange={handleBaseFieldChange}
-                onFertilizerFieldChange={handleFertilizerFieldChange}
-                onPesticideFieldChange={handlePesticideFieldChange}
-                onSave={handleSave}
-                onCancel={cancelEdit}
-              />
-            )}
+            {tab === 'fertilizer' && <FertilizerTable {...tableProps} />}
+            {tab === 'pesticide' && <PesticideTable {...tableProps} />}
+            {tab === 'seed' && <SeedTable {...tableProps} />}
+            {tab === 'misc' && <MiscTable {...tableProps} />}
           </div>
         )}
       </div>
@@ -384,6 +411,8 @@ interface TableProps {
   editingId: number | 'new' | null;
   form: MaterialFormState;
   saving: boolean;
+  seedVarietyOptions: VarietyOption[];
+  getLinkedVarietyLabel: (materialId: number) => string;
   onEdit: (material: Material) => void;
   onDelete: (material: Material) => void;
   onBaseFieldChange: (
@@ -532,13 +561,13 @@ function PesticideTable(props: TableProps) {
   );
 }
 
-function MiscTable(props: TableProps) {
+function SeedTable(props: TableProps) {
   return (
     <table className="min-w-full text-sm">
       <thead className="bg-gray-50">
         <tr className="border-b border-gray-200">
           <th className="px-4 py-3 text-left font-medium text-gray-700">資材名</th>
-          <th className="px-4 py-3 text-left font-medium text-gray-700">種別</th>
+          <th className="px-4 py-3 text-left font-medium text-gray-700">品種</th>
           <th className="px-4 py-3 text-left font-medium text-gray-700">メーカー</th>
           <th className="px-4 py-3 text-left font-medium text-gray-700">単位</th>
           <th className="px-4 py-3 text-left font-medium text-gray-700">備考</th>
@@ -547,14 +576,16 @@ function MiscTable(props: TableProps) {
         </tr>
       </thead>
       <tbody className="divide-y divide-gray-100">
-        {props.editingId === 'new' && <MaterialForm tab="misc" {...props} />}
+        {props.editingId === 'new' && <MaterialForm tab="seed" {...props} />}
         {props.materials.map((material) =>
           props.editingId === material.id ? (
-            <MaterialForm key={material.id} tab="misc" {...props} />
+            <MaterialForm key={material.id} tab="seed" {...props} />
           ) : (
             <tr key={material.id} className="hover:bg-gray-50">
               <td className="px-4 py-3 font-medium text-gray-900">{material.name}</td>
-              <td className="px-4 py-3 text-gray-600">{material.material_type_display}</td>
+              <td className="px-4 py-3 text-gray-600">
+                {props.getLinkedVarietyLabel(material.id)}
+              </td>
               <td className="px-4 py-3 text-gray-600">{material.maker || '-'}</td>
               <td className="px-4 py-3 text-gray-600">{material.stock_unit_display}</td>
               <td className="max-w-xs px-4 py-3 text-gray-600">{material.notes || '-'}</td>
@@ -583,7 +614,7 @@ function MiscTable(props: TableProps) {
   );
 }
 
-function SeedTable(props: TableProps) {
+function MiscTable(props: TableProps) {
   return (
     <table className="min-w-full text-sm">
       <thead className="bg-gray-50">
@@ -598,10 +629,10 @@ function SeedTable(props: TableProps) {
         </tr>
       </thead>
       <tbody className="divide-y divide-gray-100">
-        {props.editingId === 'new' && <MaterialForm tab="seed" {...props} />}
+        {props.editingId === 'new' && <MaterialForm tab="misc" {...props} />}
         {props.materials.map((material) =>
           props.editingId === material.id ? (
-            <MaterialForm key={material.id} tab="seed" {...props} />
+            <MaterialForm key={material.id} tab="misc" {...props} />
           ) : (
             <tr key={material.id} className="hover:bg-gray-50">
               <td className="px-4 py-3 font-medium text-gray-900">{material.name}</td>
diff --git a/frontend/src/app/materials/page.tsx b/frontend/src/app/materials/page.tsx
index f9bbb0f..7a59465 100644
--- a/frontend/src/app/materials/page.tsx
+++ b/frontend/src/app/materials/page.tsx
@@ -34,6 +34,7 @@ export default function MaterialsPage() {
   const [presetMaterialId, setPresetMaterialId] = useState<number | null>(null);
   const [presetTransactionType, setPresetTransactionType] =
     useState<StockTransaction['transaction_type'] | null>(null);
+  const [editingTransaction, setEditingTransaction] = useState<StockTransaction | null>(null);
 
   useEffect(() => {
     fetchInitialData();
@@ -94,11 +95,41 @@ export default function MaterialsPage() {
     materialId: number | null,
     transactionType: StockTransaction['transaction_type'] | null
   ) => {
+    setEditingTransaction(null);
     setPresetMaterialId(materialId);
     setPresetTransactionType(transactionType);
     setIsTransactionOpen(true);
   };
 
+  const handleEditTransaction = (transaction: StockTransaction) => {
+    setPresetMaterialId(null);
+    setPresetTransactionType(null);
+    setEditingTransaction(transaction);
+    setIsTransactionOpen(true);
+  };
+
+  const handleDeleteTransaction = async (transaction: StockTransaction) => {
+    if (!confirm(`この入出庫履歴を削除しますか？\n${transaction.transaction_type_display} ${transaction.quantity}${transaction.stock_unit_display}`)) {
+      return;
+    }
+    try {
+      await api.delete(`/materials/stock-transactions/${transaction.id}/`);
+      await handleSavedTransaction();
+    } catch (e: unknown) {
+      console.error(e);
+      const detail =
+        typeof e === 'object' &&
+        e !== null &&
+        'response' in e &&
+        typeof e.response === 'object' &&
+        e.response !== null &&
+        'data' in e.response
+          ? JSON.stringify(e.response.data)
+          : '入出庫履歴の削除に失敗しました。';
+      setError(detail);
+    }
+  };
+
   const handleSavedTransaction = async () => {
     await fetchSummaryOnly();
 
@@ -192,6 +223,8 @@ export default function MaterialsPage() {
           historyLoadingId={historyLoadingId}
           histories={histories}
           onOpenTransaction={handleOpenTransaction}
+          onEditTransaction={handleEditTransaction}
+          onDeleteTransaction={handleDeleteTransaction}
           onToggleHistory={handleToggleHistory}
         />
       </div>
@@ -201,7 +234,11 @@ export default function MaterialsPage() {
         materials={materials}
         presetMaterialId={presetMaterialId}
         presetTransactionType={presetTransactionType}
-        onClose={() => setIsTransactionOpen(false)}
+        editingTransaction={editingTransaction}
+        onClose={() => {
+          setIsTransactionOpen(false);
+          setEditingTransaction(null);
+        }}
         onSaved={handleSavedTransaction}
       />
     </div>
diff --git a/frontend/src/types/index.ts b/frontend/src/types/index.ts
index 848cd7e..27443d4 100644
--- a/frontend/src/types/index.ts
+++ b/frontend/src/types/index.ts
@@ -118,6 +118,8 @@ export interface StockTransaction {
   occurred_on: string;
   note: string;
   fertilization_plan: number | null;
+  spreading_item?: number | null;
+  is_locked: boolean;
   created_at: string;
 }