diff --git a/app/src/main/java/com/example/childguard/TestService.java b/app/src/main/java/com/example/childguard/TestService.java
index ee0a8cd..4391c20 100644
--- a/app/src/main/java/com/example/childguard/TestService.java
+++ b/app/src/main/java/com/example/childguard/TestService.java
@@ -145,9 +145,16 @@ public class TestService extends Service {
         return PendingIntent.getActivity(context, requestCode, intent, flags | PendingIntent.FLAG_IMMUTABLE);
     }
 
+    private void vibrateDevice() {
+        Vibrator vibrator = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);
+        if (vibrator.hasVibrator()) {
+            vibrator.vibrate(VibrationEffect.createOneShot(2000, VibrationEffect.DEFAULT_AMPLITUDE));
+        }
+    }
+
     public void Notification(Context context) {//実際に通知を行うメソッド
 
-        ((Vibrator) getSystemService(Context.VIBRATOR_SERVICE)).vibrate(2000);//バイブレーション
+        vibrateDevice();
 
         @SuppressLint("NotificationTrampoline") NotificationCompat.Builder builder = new NotificationCompat.Builder(context, CHANNEL_ID)
                 .setSmallIcon(android.R.drawable.ic_menu_info_details)
@@ -172,11 +179,7 @@ public class TestService extends Service {
         if (ActivityCompat.checkSelfPermission(this,
                 android.Manifest.permission.POST_NOTIFICATIONS) != PackageManager.PERMISSION_GRANTED) return;
 
-
-        Vibrator vibrator = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);
-        if (vibrator.hasVibrator()) {
-            vibrator.vibrate(VibrationEffect.createOneShot(2000, VibrationEffect.DEFAULT_AMPLITUDE));
-        }
+        vibrateDevice();
 
         NotificationCompat.Builder builder = new NotificationCompat.Builder(context, CHANNEL_ID)
                 .setSmallIcon(android.R.drawable.ic_menu_info_details)