diff --git a/app/src/main/java/com/example/childguard/bluetooth_setupFragment.java b/app/src/main/java/com/example/childguard/bluetooth_setupFragment.java
index 01677fb..04f45f8 100644
--- a/app/src/main/java/com/example/childguard/bluetooth_setupFragment.java
+++ b/app/src/main/java/com/example/childguard/bluetooth_setupFragment.java
@@ -24,6 +24,7 @@ import android.view.MenuItem;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.TextView;
+import android.widget.Toast;
 
 import java.util.ArrayList;
 import java.util.Objects;
@@ -107,12 +108,18 @@ public class bluetooth_setupFragment extends Fragment {
         if (Build.VERSION.SDK_INT < Build.VERSION_CODES.S) {
             if (ActivityCompat.checkSelfPermission(requireActivity().getApplicationContext(), android.Manifest.permission.BLUETOOTH) != PackageManager.PERMISSION_GRANTED) {
                 Log.w("Bluetooth", "Permission not granted(Android 12-)");
+                // show toast then force close the app
+                Toast.makeText(requireActivity().getApplicationContext(), "Bluetoothの権限が必須です!", Toast.LENGTH_SHORT).show();
+                requireActivity().finish();
             } else {
                 Log.w("Bluetooth", "Permission granted(Android 12-)");
             }
         } else {
             if (ActivityCompat.checkSelfPermission(requireActivity().getApplicationContext(), android.Manifest.permission.BLUETOOTH_CONNECT) != PackageManager.PERMISSION_GRANTED) {
                 Log.w("Bluetooth", "Permission not granted(Android 12+)");
+                // show toast then force close the app
+                Toast.makeText(requireActivity().getApplicationContext(), "Bluetoothの権限が必須です!", Toast.LENGTH_SHORT).show();
+                requireActivity().finish();
             } else {
                 Log.w("Bluetooth", "Permission granted(Android 12+)");
             }