diff --git a/frontend/src/app/distribution/_components/DeliveryEditPage.tsx b/frontend/src/app/distribution/_components/DeliveryEditPage.tsx
index 5740a59..69482bd 100644
--- a/frontend/src/app/distribution/_components/DeliveryEditPage.tsx
+++ b/frontend/src/app/distribution/_components/DeliveryEditPage.tsx
@@ -547,6 +547,47 @@ export default function DeliveryEditPage({ planId }: Props) {
     removeFieldFromTrip(fieldId, tripTempId);
   };
 
+  // グループの全圃場を別のtripに移動
+  const moveGroupToTrip = (groupFieldIds: number[], fromTripTempId: string, toTripTempId: string) => {
+    setTrips(prev => {
+      const fromTrip = prev.find(t => t.tempId === fromTripTempId);
+      if (!fromTrip) return prev;
+      const fieldIdSet = new Set(groupFieldIds);
+      const movingItems = fromTrip.items.filter(item => fieldIdSet.has(item.fieldId));
+      if (movingItems.length === 0) return prev;
+
+      return prev.map(t => {
+        if (t.tempId === fromTripTempId) {
+          return { ...t, items: t.items.filter(item => !fieldIdSet.has(item.fieldId)) };
+        }
+        if (t.tempId === toTripTempId) {
+          const newItems = [...t.items];
+          for (const moving of movingItems) {
+            const existing = newItems.find(
+              item => item.fieldId === moving.fieldId && item.fertilizerId === moving.fertilizerId
+            );
+            if (existing) {
+              existing.bags += moving.bags;
+            } else {
+              newItems.push({ ...moving });
+            }
+          }
+          return { ...t, items: newItems };
+        }
+        return t;
+      });
+    });
+  };
+
+  // グループの全圃場をtripから未割り当てに戻す
+  const returnGroupToUnassigned = (groupFieldIds: number[], tripTempId: string) => {
+    const fieldIdSet = new Set(groupFieldIds);
+    setTrips(prev => prev.map(t => {
+      if (t.tempId !== tripTempId) return t;
+      return { ...t, items: t.items.filter(item => !fieldIdSet.has(item.fieldId)) };
+    }));
+  };
+
   // tripのグループ小計
   const getTripGroupFertTotal = useCallback((trip: LocalTrip, fieldIds: number[], fertilizerId: number): number => {
     return trip.items
@@ -958,11 +999,34 @@ export default function DeliveryEditPage({ planId }: Props) {
                                 {/* グループ小計行 */}
                                 <div className="flex items-center gap-2 bg-green-50 px-2 py-1 rounded text-sm font-medium text-green-800">
                                   <span>★ {groupName}</span>
-                                  <span className="text-xs text-green-600 ml-auto">
+                                  <span className="text-xs text-green-600 flex-1 text-right">
                                     {groupFertTotals.map((f, i) => (
                                       <span key={f.id}>{i > 0 ? '  ' : ''}{f.name}: {f.total.toFixed(2)}</span>
                                     ))}
                                   </span>
+                                  {fieldIds.length > 1 && (
+                                    <select
+                                      value=""
+                                      onChange={e => {
+                                        const val = e.target.value;
+                                        if (val === '__unassigned__') {
+                                          returnGroupToUnassigned(fieldIds, trip.tempId);
+                                        } else if (val) {
+                                          moveGroupToTrip(fieldIds, trip.tempId, val);
+                                        }
+                                      }}
+                                      className="border border-gray-300 rounded px-1.5 py-0.5 text-xs font-normal text-gray-600 focus:outline-none focus:ring-1 focus:ring-blue-500 flex-shrink-0"
+                                    >
+                                      <option value="">移動...</option>
+                                      {trips.filter(t => t.tempId !== trip.tempId).map(t => {
+                                        const displayIdx = trips.indexOf(t) + 1;
+                                        return (
+                                          <option key={t.tempId} value={t.tempId}>→ {displayIdx}回目{t.name ? ` (${t.name})` : ''}</option>
+                                        );
+                                      })}
+                                      <option value="__unassigned__">← 戻す</option>
+                                    </select>
+                                  )}
                                 </div>
                                 {/* 圃場行 */}
                                 {fieldIds.map(fId => {