diff --git a/feature/debug/src/main/java/one/nem/lacerta/feature/debug/DebugMenuFragment.java b/feature/debug/src/main/java/one/nem/lacerta/feature/debug/DebugMenuFragment.java
index a3729901..82870f2b 100644
--- a/feature/debug/src/main/java/one/nem/lacerta/feature/debug/DebugMenuFragment.java
+++ b/feature/debug/src/main/java/one/nem/lacerta/feature/debug/DebugMenuFragment.java
@@ -4,14 +4,15 @@ import android.os.Bundle;
 
 import androidx.fragment.app.Fragment;
 import androidx.navigation.Navigation;
-import androidx.navigation.ui.NavigationUI;
 
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
-import android.widget.Button;
 import android.widget.Toast;
 
+import java.io.File;
+import java.io.IOException;
+
 import dagger.hilt.android.AndroidEntryPoint;
 import javax.inject.Inject;
 
@@ -82,7 +83,18 @@ public class DebugMenuFragment extends Fragment {
             Toast.makeText(getContext(), getContext().getExternalFilesDir(null).toPath().toString(), Toast.LENGTH_SHORT).show();
         });
 
-        view.findViewById(R.id.btn_debug_menu_go_to_repository_debugger).setOnClickListener( v -> {
+        view.findViewById(R.id.btn_debug_menu_file_write_test).setOnClickListener( v -> {
+            File file = getContext().getExternalFilesDir(null);
+            // ファイル書き込みテスト
+            try {
+                File testFile = new File(file, "test.txt");
+                testFile.createNewFile();
+            } catch (IOException e) {
+                e.printStackTrace();
+            }
+        });
+
+        view.findViewById(R.id.btn_debug_menu_go_to_repository_debug).setOnClickListener(v -> {
             Navigation.findNavController(view).navigate(R.id.action_debugMenuFragment_to_debugRepositoryDebuggerFragment);
         });
 
diff --git a/feature/debug/src/main/res/layout/fragment_debug_menu.xml b/feature/debug/src/main/res/layout/fragment_debug_menu.xml
index 73334037..9c6f6793 100644
--- a/feature/debug/src/main/res/layout/fragment_debug_menu.xml
+++ b/feature/debug/src/main/res/layout/fragment_debug_menu.xml
@@ -119,6 +119,26 @@
                 android:layout_width="match_parent"
                 android:layout_height="16dp" />
 
+            <com.google.android.material.textview.MaterialTextView
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:padding="8dp"
+                android:text="File Debug"
+                android:textSize="24sp" />
+
+            <com.google.android.material.button.MaterialButton
+                android:id="@+id/btn_debug_menu_file_write_test"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:layout_marginStart="16dp"
+                android:layout_marginTop="8dp"
+                android:layout_marginEnd="16dp"
+                android:text="Repository Debugger" />
+
+            <View
+                android:layout_width="match_parent"
+                android:layout_height="16dp" />
+
             <com.google.android.material.textview.MaterialTextView
                 android:layout_width="match_parent"
                 android:layout_height="wrap_content"
@@ -127,7 +147,7 @@
                 android:textSize="24sp" />
 
             <com.google.android.material.button.MaterialButton
-                android:id="@+id/btn_debug_menu_go_to_repository_debugger"
+                android:id="@+id/btn_debug_menu_go_to_repository_debug"
                 android:layout_width="match_parent"
                 android:layout_height="wrap_content"
                 android:layout_marginStart="16dp"