diff --git a/popcorn/Assets/MyGame/Scripts/GameDataObserver.cs b/popcorn/Assets/MyGame/Scripts/GameDataObserver.cs
index 805ac07c..558733bd 100644
--- a/popcorn/Assets/MyGame/Scripts/GameDataObserver.cs
+++ b/popcorn/Assets/MyGame/Scripts/GameDataObserver.cs
@@ -30,7 +30,7 @@ public class GameDataObserver : SingletonMonoBehaviour<GameDataObserver>
 
     private GameData globalGameData;
     private GameData cityGameData;
-    private readonly List<MissionData> MissionDataList = SpreadsheetDataManager.Instance.GetBaseDataList<MissionData>(Const.MissionDataSheet);
+    private List<MissionData> missionDataList;
     private List<MissionData> latestNormalMissions;
     private List<MissionData> normalMissionList;
 
@@ -66,7 +66,8 @@ public class GameDataObserver : SingletonMonoBehaviour<GameDataObserver>
             }).AddTo(this);
         
         // ミッション達成チェッカー
-        normalMissionList = MissionDataList.Where(data => data.Category == MissionCategory.Normal).ToList();
+        missionDataList = SpreadsheetDataManager.Instance.GetBaseDataList<MissionData>(Const.MissionDataSheet);
+        normalMissionList = missionDataList.Where(data => data.Category == MissionCategory.Normal).ToList();
         UpdateLatestNormalMissions();
         
         // 店舗レベルアップorミッション達成でリスト更新して達成チェック
@@ -128,7 +129,7 @@ public class GameDataObserver : SingletonMonoBehaviour<GameDataObserver>
                 globalGameData.dailyMissionCompleted = false;
                 globalGameData.ResetDailyTotalCount();
                 // 新ミッション登録
-                var targetList = MissionDataList
+                var targetList = missionDataList
                     .Where(data => data.Category == MissionCategory.Daily && data.shopLevel <= globalGameData.ViewedShopLevel)
                     .Where(data => MissionManager.CheckAvailableMission(data, globalGameData.MyRecipes))
                     .ToList();
@@ -177,7 +178,7 @@ public class GameDataObserver : SingletonMonoBehaviour<GameDataObserver>
     {
         var ids = globalGameData.dailyMissionIdArray
             .Except(globalGameData.dailyMissionAchievedIdArray);
-        if (MissionDataList
+        if (missionDataList
             .Where(data => ids.Contains(data.id))
             .Any(missionData => missionData.count <= MissionManager.GetDailyProgressValue(missionData)))
         {