diff --git a/app/src/main/java/one/nem/lacerta/MainActivity.java b/app/src/main/java/one/nem/lacerta/MainActivity.java
index f74b20a7..d7fac694 100644
--- a/app/src/main/java/one/nem/lacerta/MainActivity.java
+++ b/app/src/main/java/one/nem/lacerta/MainActivity.java
@@ -1,5 +1,6 @@
 package one.nem.lacerta;
 
+import androidx.annotation.NonNull;
 import androidx.appcompat.app.AppCompatActivity;
 import androidx.appcompat.widget.Toolbar;
 import androidx.core.content.ContextCompat;
@@ -11,6 +12,7 @@ import androidx.navigation.fragment.NavHostFragment;
 import androidx.navigation.ui.NavigationUI;
 
 import android.content.Intent;
+import android.content.pm.PackageManager;
 import android.graphics.Color;
 import android.os.Bundle;
 import android.util.Log;
@@ -85,6 +87,21 @@ public class MainActivity extends AppCompatActivity implements FragmentNavigatio
         });
 
     }
+
+    @Override
+    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
+        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
+        if (requestCode == 1) {
+            if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
+                Toast.makeText(this, "Permission granted", Toast.LENGTH_SHORT).show();
+            } else {
+                Toast.makeText(this, "Permission denied", Toast.LENGTH_SHORT).show();
+                Toast.makeText(this, "カメラの権限は必須です.", Toast.LENGTH_LONG).show();
+                finish(); // Exit app
+            }
+        }
+    }
+
     private void initializeApp() {
         Log.d("Init", "Initializing app");
         // Set feature switch override to default value
diff --git a/component/scanner/src/main/java/one/nem/lacerta/component/scanner/ScannerManagerActivity.java b/component/scanner/src/main/java/one/nem/lacerta/component/scanner/ScannerManagerActivity.java
index dcfc89fa..80cf6ae5 100644
--- a/component/scanner/src/main/java/one/nem/lacerta/component/scanner/ScannerManagerActivity.java
+++ b/component/scanner/src/main/java/one/nem/lacerta/component/scanner/ScannerManagerActivity.java
@@ -1,6 +1,8 @@
 package one.nem.lacerta.component.scanner;
 
+import android.Manifest;
 import android.app.ProgressDialog;
+import android.content.pm.PackageManager;
 import android.graphics.Bitmap;
 import android.graphics.BitmapFactory;
 import android.os.Bundle;
@@ -11,6 +13,8 @@ import android.widget.Toast;
 
 import androidx.activity.EdgeToEdge;
 import androidx.appcompat.app.AppCompatActivity;
+import androidx.core.app.ActivityCompat;
+import androidx.core.content.ContextCompat;
 import androidx.core.graphics.Insets;
 import androidx.core.view.ViewCompat;
 import androidx.core.view.WindowInsetsCompat;
@@ -92,6 +96,14 @@ public class ScannerManagerActivity extends AppCompatActivity {
             return insets;
         });
 
+
+
+        if (ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA)
+                != PackageManager.PERMISSION_GRANTED) {
+            ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.CAMERA}, 1); // TODO-rca: リクエストコードを定数にする
+        }
+
+
         MaterialToolbar toolbar = findViewById(R.id.top_toolbar);
         setSupportActionBar(toolbar);
         Objects.requireNonNull(getSupportActionBar()).setDisplayHomeAsUpEnabled(true);
@@ -116,11 +128,12 @@ public class ScannerManagerActivity extends AppCompatActivity {
             Toast.makeText(this, "保存処理", Toast.LENGTH_SHORT).show();
             saveNewDocument();
             return true;
-        } else if (item.getItemId() == R.id.action_insert_exist) {
-            // 既存ドキュメントに挿入
-            Toast.makeText(this, "Work in progress", Toast.LENGTH_SHORT).show();
-            insertToExistDocument();
-            return true;
+//        }
+//        else if (item.getItemId() == R.id.action_insert_exist) {
+//            // 既存ドキュメントに挿入
+//            Toast.makeText(this, "Work in progress", Toast.LENGTH_SHORT).show();
+//            insertToExistDocument();
+//            return true;
         } else if (item.getItemId() == android.R.id.home) {
             finish();
             return true;
diff --git a/component/scanner/src/main/res/menu/scanner_result_toolbar.xml b/component/scanner/src/main/res/menu/scanner_result_toolbar.xml
index 3321aadc..dc815d7b 100644
--- a/component/scanner/src/main/res/menu/scanner_result_toolbar.xml
+++ b/component/scanner/src/main/res/menu/scanner_result_toolbar.xml
@@ -6,9 +6,9 @@
         android:icon="@drawable/save_24px"
         android:title="Save"
         app:showAsAction="ifRoom"/>
-    <item
-        android:id="@+id/action_insert_exist"
-        android:icon="@drawable/ic_baseline_add_24"
-        android:title="Save"
-        app:showAsAction="ifRoom"/>
+<!--    <item-->
+<!--        android:id="@+id/action_insert_exist"-->
+<!--        android:icon="@drawable/description_24px"-->
+<!--        android:title="Insert"-->
+<!--        app:showAsAction="ifRoom"/>-->
 </menu>
\ No newline at end of file