diff --git a/backend/src/main/java/com/example/todoapp/controller/StocksController.java b/backend/src/main/java/com/example/todoapp/controller/StocksController.java
index 8ff6691..cdced2e 100644
--- a/backend/src/main/java/com/example/todoapp/controller/StocksController.java
+++ b/backend/src/main/java/com/example/todoapp/controller/StocksController.java
@@ -3,6 +3,7 @@ package com.example.todoapp.controller;
 import com.example.todoapp.dto.DeleteStockRequest;
 import com.example.todoapp.dto.ResponseStockDTO;
 import com.example.todoapp.dto.StockDTO;
+import com.example.todoapp.dto.UpdateStockRequest;
 import com.example.todoapp.model.Stocks;
 import com.example.todoapp.service.StocksService;
 import jakarta.validation.Valid;
@@ -90,7 +91,7 @@ public class StocksController {
     @PutMapping("/update")
     public ResponseEntity<Map<String, Object>> updateStock(
             Authentication authentication,
-            @Valid @RequestBody Stocks stockDetails) {
+            @Valid @RequestBody UpdateStockRequest stockDetails) {
         
         stockService.updateStocks(authentication.getName(), stockDetails);
 
diff --git a/backend/src/main/java/com/example/todoapp/dto/UpdateStockRequest.java b/backend/src/main/java/com/example/todoapp/dto/UpdateStockRequest.java
new file mode 100644
index 0000000..68a3105
--- /dev/null
+++ b/backend/src/main/java/com/example/todoapp/dto/UpdateStockRequest.java
@@ -0,0 +1,22 @@
+package com.example.todoapp.dto;
+import java.time.LocalDate;
+
+import lombok.Data;
+
+/**
+ * 在庫削除のリクエストオブジェクト（DTO）
+ * <p>
+ * このクラスはクライアントとサーバー間で在庫情報をやり取りするために使用されます。
+ * エンティティとは異なり、必要な情報のみを含み、関連エンティティへの参照ではなくIDのみを保持します。
+ * </p>
+ */
+
+@Data
+public class UpdateStockRequest {
+    private Long stockId;
+    private int amount;
+    private int price;
+    private LocalDate buyDate;
+    private LocalDate lastUpdate;
+    private LocalDate expDate;
+}
\ No newline at end of file
diff --git a/backend/src/main/java/com/example/todoapp/service/StocksService.java b/backend/src/main/java/com/example/todoapp/service/StocksService.java
index 68d6eaf..cfd7c03 100644
--- a/backend/src/main/java/com/example/todoapp/service/StocksService.java
+++ b/backend/src/main/java/com/example/todoapp/service/StocksService.java
@@ -1,5 +1,6 @@
 package com.example.todoapp.service;
 
+import com.example.todoapp.dto.UpdateStockRequest;
 import com.example.todoapp.model.Stocks;
 import com.example.todoapp.util.MessageUtils;
 import com.example.todoapp.model.User;
@@ -75,7 +76,7 @@ public class StocksService {
      * @param stockDetails 編集内容(新しい情報)
      * @return 編集された在庫エンティティ
      */
-    public Stocks updateStocks(String username, Stocks stockDetails) {
+    public Stocks updateStocks(String username, UpdateStockRequest stockDetails) {
         Stocks stock = getStockById(username, stockDetails.getStockId());
         stock.setAmount(stockDetails.getAmount());
         stock.setPrice(stockDetails.getPrice());