diff --git a/frontend/src/pages/StockPage.tsx b/frontend/src/pages/StockPage.tsx
index 899bce1..a555b84 100644
--- a/frontend/src/pages/StockPage.tsx
+++ b/frontend/src/pages/StockPage.tsx
@@ -106,8 +106,14 @@ const StockPage: React.FC = () => {
       if (newStock.newAddition) {
         newStock.stuffId = null;
       }
-      if (isNaN(newStock.amount)) return;
-      if (isNaN(newStock.price)) return;
+      if (isNaN(newStock.amount)) {
+        showErrorMessage(GENERAL_ERRORS.INVALID_AMOUNT);
+        return;
+      }
+      if (isNaN(newStock.price)) {
+        showErrorMessage(GENERAL_ERRORS.INVALID_PRICE);
+        return;
+      }
 
       if (newStock.buyAmount !== null && isNaN(newStock.buyAmount)) {
         newStock.buyAmount = null;
@@ -263,7 +269,11 @@ const StockPage: React.FC = () => {
         setIsDeleteOpen(true);        // 削除ダイアログを開く
         return;
       }
-      if (!numericAmount || !numericBuyAmount) {
+      // if (!numericAmount || !numericBuyAmount) {
+      //   showErrorMessage(GENERAL_ERRORS.INVALID_AMOUNT);
+      //   return;
+      // }
+      if (!numericAmount) {
         showErrorMessage(GENERAL_ERRORS.INVALID_AMOUNT);
         return;
       }