diff --git a/backend/apps/levee_work/serializers.py b/backend/apps/levee_work/serializers.py
index 32aa780..e46d1f3 100644
--- a/backend/apps/levee_work/serializers.py
+++ b/backend/apps/levee_work/serializers.py
@@ -1,4 +1,5 @@
 from django.db import transaction
+from decimal import Decimal
 from rest_framework import serializers
 
 from apps.plans.models import Plan
@@ -34,6 +35,7 @@ class LeveeWorkSessionSerializer(serializers.ModelSerializer):
     items = LeveeWorkSessionItemReadSerializer(many=True, read_only=True)
     work_record_id = serializers.IntegerField(source='work_record.id', read_only=True)
     item_count = serializers.SerializerMethodField()
+    total_area_tan = serializers.SerializerMethodField()
 
     class Meta:
         model = LeveeWorkSession
@@ -45,6 +47,7 @@ class LeveeWorkSessionSerializer(serializers.ModelSerializer):
             'notes',
             'work_record_id',
             'item_count',
+            'total_area_tan',
             'items',
             'created_at',
             'updated_at',
@@ -53,6 +56,10 @@ class LeveeWorkSessionSerializer(serializers.ModelSerializer):
     def get_item_count(self, obj):
         return len(obj.items.all())
 
+    def get_total_area_tan(self, obj):
+        total = sum((item.field.area_tan or Decimal('0')) for item in obj.items.all())
+        return str(total)
+
 
 class LeveeWorkSessionItemWriteInputSerializer(serializers.Serializer):
     field = serializers.IntegerField()
diff --git a/backend/apps/levee_work/tests.py b/backend/apps/levee_work/tests.py
new file mode 100644
index 0000000..ac6c4f0
--- /dev/null
+++ b/backend/apps/levee_work/tests.py
@@ -0,0 +1,58 @@
+from django.test import TestCase
+
+from apps.fields.models import Field
+from apps.plans.models import Crop, Plan, Variety
+
+from .models import LeveeWorkSession, LeveeWorkSessionItem
+from .serializers import LeveeWorkSessionSerializer
+
+
+class LeveeWorkSessionSerializerTests(TestCase):
+    def test_total_area_tan_is_included(self):
+        crop = Crop.objects.create(name='水稲')
+        variety = Variety.objects.create(crop=crop, name='にこまる')
+        field_a = Field.objects.create(
+            name='足川北上',
+            address='高知県高岡郡',
+            area_tan='1.2000',
+            area_m2=1200,
+            owner_name='吉田',
+            group_name='北',
+            display_order=1,
+        )
+        field_b = Field.objects.create(
+            name='足川南',
+            address='高知県高岡郡',
+            area_tan='0.8000',
+            area_m2=800,
+            owner_name='吉田',
+            group_name='南',
+            display_order=2,
+        )
+        plan_a = Plan.objects.create(field=field_a, year=2026, crop=crop, variety=variety, notes='')
+        plan_b = Plan.objects.create(field=field_b, year=2026, crop=crop, variety=variety, notes='')
+        session = LeveeWorkSession.objects.create(
+            year=2026,
+            date='2026-04-06',
+            title='水稲畔塗',
+            notes='',
+        )
+        LeveeWorkSessionItem.objects.create(
+            session=session,
+            field=field_a,
+            plan=plan_a,
+            crop_name_snapshot='水稲',
+            variety_name_snapshot='にこまる',
+        )
+        LeveeWorkSessionItem.objects.create(
+            session=session,
+            field=field_b,
+            plan=plan_b,
+            crop_name_snapshot='水稲',
+            variety_name_snapshot='にこまる',
+        )
+
+        data = LeveeWorkSessionSerializer(session).data
+
+        self.assertEqual(data['item_count'], 2)
+        self.assertEqual(data['total_area_tan'], '2.0000')
diff --git a/frontend/src/app/levee-work/page.tsx b/frontend/src/app/levee-work/page.tsx
index 6117f6a..8466fa4 100644
--- a/frontend/src/app/levee-work/page.tsx
+++ b/frontend/src/app/levee-work/page.tsx
@@ -203,6 +203,10 @@ function LeveeWorkPageContent() {
     return sortedCandidates.filter((candidate) => form.selectedFieldIds.has(candidate.field_id));
   }, [form, sortedCandidates]);
 
+  const selectedAreaTan = useMemo(() => {
+    return selectedCandidates.reduce((sum, candidate) => sum + Number(candidate.field_area_tan || '0'), 0);
+  }, [selectedCandidates]);
+
   const handleSort = (nextKey: SortKey) => {
     if (sortKey === nextKey) {
       setSortDirection((current) => (current === 'asc' ? 'desc' : 'asc'));
@@ -335,7 +339,9 @@ function LeveeWorkPageContent() {
                   >
                     <div className="text-sm font-medium text-gray-900">{session.title}</div>
                     <div className="mt-1 text-sm text-gray-600">{session.date}</div>
-                    <div className="mt-1 text-xs text-gray-500">{session.item_count}圃場</div>
+                    <div className="mt-1 text-xs text-gray-500">
+                      {session.item_count}圃場 / {Number(session.total_area_tan).toFixed(2)}反
+                    </div>
                   </button>
                 ))}
               </div>
@@ -388,7 +394,9 @@ function LeveeWorkPageContent() {
                   <div className="mb-3 flex flex-wrap items-center justify-between gap-3">
                     <div>
                       <h2 className="text-sm font-medium text-gray-900">対象圃場一覧</h2>
-                      <p className="text-xs text-gray-500">{selectedCount} / {candidates.length} 圃場を選択中</p>
+                      <p className="text-xs text-gray-500">
+                        {selectedCount} / {candidates.length} 圃場を選択中 / 合計 {selectedAreaTan.toFixed(2)}反
+                      </p>
                     </div>
                     <div className="flex gap-2">
                       <button
diff --git a/frontend/src/types/index.ts b/frontend/src/types/index.ts
index 3284fe6..300859c 100644
--- a/frontend/src/types/index.ts
+++ b/frontend/src/types/index.ts
@@ -345,6 +345,7 @@ export interface LeveeWorkSession {
   notes: string;
   work_record_id: number | null;
   item_count: number;
+  total_area_tan: string;
   items: LeveeWorkSessionItem[];
   created_at: string;
   updated_at: string;