diff --git a/app/src/main/java/com/example/childguard/TestService.java b/app/src/main/java/com/example/childguard/TestService.java
index 65e6a2b..076175a 100644
--- a/app/src/main/java/com/example/childguard/TestService.java
+++ b/app/src/main/java/com/example/childguard/TestService.java
@@ -16,6 +16,7 @@ import android.graphics.Color;
 import android.os.Build;
 import android.os.Handler;
 import android.os.IBinder;
+import android.os.VibrationEffect;
 import android.os.Vibrator;
 import android.preference.PreferenceManager;
 import android.util.Log;
@@ -175,7 +176,10 @@ public class TestService extends Service {
         int flags = 0;
         PendingIntent pendingIntent = PendingIntent.getActivity(context, requestCode, intent, flags | PendingIntent.FLAG_IMMUTABLE);
 
-        ((Vibrator) getSystemService(Context.VIBRATOR_SERVICE)).vibrate(2000);//バイブレーション
+        Vibrator vibrator = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);
+        if (vibrator.hasVibrator()) {
+            vibrator.vibrate(VibrationEffect.createOneShot(2000, VibrationEffect.DEFAULT_AMPLITUDE));
+        }
 
         @SuppressLint("NotificationTrampoline") NotificationCompat.Builder builder = new NotificationCompat.Builder(context, "CHANNEL_ID")
                 .setSmallIcon(android.R.drawable.ic_menu_info_details)