diff --git a/frontend/src/app/distribution/_components/DeliveryEditPage.tsx b/frontend/src/app/distribution/_components/DeliveryEditPage.tsx
index a4637bb..5740a59 100644
--- a/frontend/src/app/distribution/_components/DeliveryEditPage.tsx
+++ b/frontend/src/app/distribution/_components/DeliveryEditPage.tsx
@@ -433,6 +433,32 @@ export default function DeliveryEditPage({ planId }: Props) {
     ]);
   };
 
+  // グループの全圃場をtripに一括割り当て
+  const assignGroupToTrip = (groupTempId: string, tripTempId: string) => {
+    const group = groups.find(g => g.tempId === groupTempId);
+    if (!group) return;
+    setTrips(prev => prev.map(t => {
+      if (t.tempId !== tripTempId) return t;
+      const newItems = [...t.items];
+      for (const fieldId of group.fieldIds) {
+        for (const fert of selectedFertilizers) {
+          const remaining = getUnassignedBags(fieldId, fert.id);
+          if (remaining > 0) {
+            const existing = newItems.find(
+              item => item.fieldId === fieldId && item.fertilizerId === fert.id
+            );
+            if (existing) {
+              existing.bags += remaining;
+            } else {
+              newItems.push({ fieldId, fertilizerId: fert.id, bags: remaining });
+            }
+          }
+        }
+      }
+      return { ...t, items: newItems };
+    }));
+  };
+
   // tripの中の圃場IDを取得（表示用・重複なし）
   const getTripFieldIds = useCallback((trip: LocalTrip): number[] => {
     const seen = new Set<number>();
@@ -989,9 +1015,31 @@ export default function DeliveryEditPage({ planId }: Props) {
                         </div>
                       )}
 
-                      {/* このtripに圃場を追加 */}
+                      {/* このtripに追加 */}
                       {hasUnassignedBags && (
-                        <div className="mt-2 pt-2 border-t border-gray-100">
+                        <div className="mt-2 pt-2 border-t border-gray-100 flex gap-2 flex-wrap">
+                          {/* グループ一括追加 */}
+                          <select
+                            value=""
+                            onChange={e => {
+                              if (e.target.value) {
+                                assignGroupToTrip(e.target.value, trip.tempId);
+                              }
+                            }}
+                            className="border border-gray-300 rounded px-2 py-1 text-xs focus:outline-none focus:ring-1 focus:ring-green-500"
+                          >
+                            <option value="">+ グループを追加...</option>
+                            {groups.map(g => {
+                              const hasRemaining = g.fieldIds.some(fId =>
+                                selectedFertilizers.some(f => getUnassignedBags(fId, f.id) > 0)
+                              );
+                              if (!hasRemaining) return null;
+                              return (
+                                <option key={g.tempId} value={g.tempId}>★ {g.name}（{g.fieldIds.length}圃場）</option>
+                              );
+                            })}
+                          </select>
+                          {/* 圃場単体追加 */}
                           <select
                             value=""
                             onChange={e => {
@@ -1002,7 +1050,6 @@ export default function DeliveryEditPage({ planId }: Props) {
                             className="border border-gray-300 rounded px-2 py-1 text-xs focus:outline-none focus:ring-1 focus:ring-green-500"
                           >
                             <option value="">+ 圃場を追加...</option>
-                            {/* グループごとにまとめて表示 */}
                             {groups.map(g => {
                               const fieldsWithRemaining = g.fieldIds.filter(fId =>
                                 selectedFertilizers.some(f => getUnassignedBags(fId, f.id) > 0)
@@ -1016,7 +1063,6 @@ export default function DeliveryEditPage({ planId }: Props) {
                                 </optgroup>
                               );
                             })}
-                            {/* 未グループ */}
                             {unassignedFields.filter(fi =>
                               selectedFertilizers.some(f => getUnassignedBags(fi.id, f.id) > 0)
                             ).length > 0 && (