diff --git a/frontend/src/app/fertilizer/_components/FertilizerEditPage.tsx b/frontend/src/app/fertilizer/_components/FertilizerEditPage.tsx
index dfbb4ce..3130e82 100644
--- a/frontend/src/app/fertilizer/_components/FertilizerEditPage.tsx
+++ b/frontend/src/app/fertilizer/_components/FertilizerEditPage.tsx
@@ -303,6 +303,10 @@ export default function FertilizerEditPage({ planId }: { planId?: number }) {
       });
     });
 
+    if (entries.length === 0) {
+      if (!confirm('袋数が1件も入力されていません。このまま保存しますか？\n（後から編集画面で袋数を入力できます）')) return;
+    }
+
     setSaving(true);
     try {
       const payload = { name, year, variety: varietyId, entries };
@@ -311,6 +315,7 @@ export default function FertilizerEditPage({ planId }: { planId?: number }) {
       } else {
         await api.put(`/fertilizer/plans/${planId}/`, payload);
       }
+      alert('保存しました');
       router.push('/fertilizer');
     } catch (e: unknown) {
       const err = e as { response?: { data?: unknown } };