diff --git a/popcorn/Assets/MyGame/Scenes/marketing/Scripts/ProductManagement.cs b/popcorn/Assets/MyGame/Scenes/marketing/Scripts/ProductManagement.cs
index c8f908c5..44017713 100644
--- a/popcorn/Assets/MyGame/Scenes/marketing/Scripts/ProductManagement.cs
+++ b/popcorn/Assets/MyGame/Scenes/marketing/Scripts/ProductManagement.cs
@@ -88,13 +88,13 @@ public class ProductManagement : MonoBehaviour
                 tankView.SetState(isSmallest ? TankState.Lock : TankState.Unavailable);
                 // タンク購入
                 var shopData = shopDataList.First(data => data.id == Const.ShopTankId);
-                shopData.price = PriceList[tankView.TankNumber - 1];
+                var price = PriceList[tankView.TankNumber - 1];
                 
                 // 購入可否
-                tankView.SetCanBuy(shopData.price <= CoinManager.Instance.OwnCoin);
+                tankView.SetCanBuy(price <= CoinManager.Instance.OwnCoin);
                 
                 tankView.PurchaseButtonObservable
-                    .Where(_ => shopData.price <= CoinManager.Instance.OwnCoin)
+                    .Where(_ => price <= CoinManager.Instance.OwnCoin)
                     .TakeWhile(_ => tankView.State.Value == TankState.Lock || tankView.State.Value == TankState.Unavailable)
                     .Subscribe(_ =>
                     {
@@ -104,7 +104,7 @@ public class ProductManagement : MonoBehaviour
                             gameData.StorageTanks.Add(new StorageTank { Capacity = Const.TankCapacity });
                             tankView.SetData(gameData.StorageTanks[tankView.TankNumber - 1]);
                             tankView.SetState(TankState.Unlock);
-                            CoinManager.Instance.SubCoin(shopData.price);
+                            CoinManager.Instance.SubCoin(price);
                             gameData.Coin = CoinManager.Instance.OwnCoin;
                             GameDataManager.SaveGameData();
                             // 次に大きいタンクの購入ボタンを表示
@@ -115,7 +115,7 @@ public class ProductManagement : MonoBehaviour
                             }
                         }
 
-                        shopData.price = PriceList[tankView.TankNumber - 1];
+                        shopData.price = price;
                         ShopItemPurchaseView.ShowDialog((shopData, 0), PurchaseAction);
                     }).AddTo(tankView);
             }