diff --git a/app/src/main/java/com/example/childguard/TestService.java b/app/src/main/java/com/example/childguard/TestService.java
index 300a3c1..b9df826 100644
--- a/app/src/main/java/com/example/childguard/TestService.java
+++ b/app/src/main/java/com/example/childguard/TestService.java
@@ -28,6 +28,9 @@ import com.google.firebase.firestore.FirebaseFirestore;
 
 public class TestService extends Service {
 
+    private Handler handler = new Handler();
+    private Runnable notificationRunnable;
+
     public static class NotificationContent {
         private final String title;
         private final String description;
@@ -266,16 +269,24 @@ public class TestService extends Service {
             SharedPreferences.Editor e = pref.edit();
             String action = intent.getAction(); // may need to chain this to a recognizing function
             boolean isInCar = pref.getBoolean("isInCarPref", false);
-            if (BluetoothDevice.ACTION_ACL_DISCONNECTED.equals(action) && !isInCar) {//bluetoothが切断されたときに乗車状態のとき
-                // 5分待機する
-                Handler handler = new Handler();
-                handler.postDelayed(new Runnable() {
+            if (BluetoothDevice.ACTION_ACL_DISCONNECTED.equals(action) && !isInCar) {
+                // bluetoothが切断されたときに乗車状態のとき
+                notificationRunnable = new Runnable() {
                     @Override
                     public void run() {
+                        // 5分経過した時点でも車に乗っていない場合
                         Notification(context, BLUETOOTH_NOTIFICATION);
                     }
+                };
 
-                }, 5 * 60 * 1000); // 5分をミリ秒に変換
+                handler.postDelayed(notificationRunnable, 5 * 60 * 1000); // 5分をミリ秒に変換
+            } else if (BluetoothDevice.ACTION_ACL_CONNECTED.equals(action)) {
+                // 再接続された場合、通知をキャンセルする
+                if (notificationRunnable != null) {
+                    handler.removeCallbacks(notificationRunnable);
+                    notificationRunnable = null;
+                    Log.d("BT", "Notification canceled due to reconnection");
+                }
             }
         }
     };