diff --git a/popcorn/Assets/MyGame/Scripts/GameDataUtils.cs b/popcorn/Assets/MyGame/Scripts/GameDataUtils.cs
new file mode 100644
index 00000000..7c8d4662
--- /dev/null
+++ b/popcorn/Assets/MyGame/Scripts/GameDataUtils.cs
@@ -0,0 +1,61 @@
+using System.Linq;
+
+namespace MyGame.Scripts
+{
+    public static class GameDataUtils
+    {
+        public static int GetPartTimerHeart(int cityId)
+        {
+            var cityDataList = GameDataManager.GameData.CityGameDataDict.Values;
+            var fundedList = cityDataList.Where(data => data.IsFundingCompleted).ToList();
+            
+            // 初期店舗の場合リスト内で１店舗解放済みであればOK
+            if (cityId == Const.DefaultCityId && fundedList.Count == 1)
+            {
+                return fundedList[0].Heart;
+            }
+            
+            // バイト開放には店舗が2つ以上必要
+            if (fundedList.Count < 2)
+            {
+                return 0;
+            }
+        
+            // 最新の店舗ハート数＋1つ前の店舗のBrotherHeart
+            var cities = fundedList.TakeLast(2).ToArray();
+            var prevCityBrotherHeart = cities[0].BrotherHeart;
+            var latestCityHeart = cities[1].Heart;
+            // 都市開放時のハート取得
+            var baseBrotherHeart = GameDataManager.GetCityGameData(cityId).BrotherHeart;
+            return prevCityBrotherHeart + latestCityHeart - baseBrotherHeart;
+        }
+
+        /// <summary>
+        /// 都市が最新店舗かどうか判定
+        /// 資金調達済みの都市データ内で最後尾なら最新店舗
+        /// </summary>
+        /// <param name="cityId"></param>
+        /// <returns></returns>
+        public static bool CheckLatestCity(int cityId)
+        {
+            if (cityId == Const.DefaultCityId)
+            {
+                return !GameDataManager.GameData.CityGameDataDict.Values.Any(data => data.IsFundingCompleted);
+            }
+            return GameDataManager.GameData.CityGameDataDict.LastOrDefault(pair => pair.Value.IsFundingCompleted).Key == cityId;
+        }
+
+        public static GameData CreateCityData(int cityId)
+        {
+            var dict = GameDataManager.GameData.CityGameDataDict;
+            if (dict.ContainsKey(cityId))
+            {
+                return dict[cityId];
+            }
+            var newCityData = new GameData();
+            newCityData.OnDeserialized();
+            dict.Add(cityId, newCityData);
+            return dict[cityId];
+        }
+    }
+}
\ No newline at end of file
diff --git a/popcorn/Assets/MyGame/Scripts/GameDataUtils.cs.meta b/popcorn/Assets/MyGame/Scripts/GameDataUtils.cs.meta
new file mode 100644
index 00000000..a54332e2
--- /dev/null
+++ b/popcorn/Assets/MyGame/Scripts/GameDataUtils.cs.meta
@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: b5c1a064cc6f4254b2b637b24478c58e
+timeCreated: 1663307584
\ No newline at end of file