diff --git a/app/src/main/java/com/example/nemophila/MapsDialogFragment.java b/app/src/main/java/com/example/nemophila/MapsDialogFragment.java
new file mode 100644
index 0000000..2e68a31
--- /dev/null
+++ b/app/src/main/java/com/example/nemophila/MapsDialogFragment.java
@@ -0,0 +1,29 @@
+package com.example.nemophila;
+
+import android.app.AlertDialog;
+import android.app.Dialog;
+import android.content.DialogInterface;
+import android.os.Bundle;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.fragment.app.DialogFragment;
+
+public class MapsDialogFragment extends DialogFragment {
+
+    @NonNull
+    @Override
+    public Dialog onCreateDialog(@Nullable Bundle savedInstanceState) {
+        AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
+
+        builder.setTitle("投稿したいお店はこの中にありますか？")
+                .setMessage("ここにメッセージを入力します")
+                .setPositiveButton("OK", new DialogInterface.OnClickListener() {
+                    public void onClick(DialogInterface dialog, int id) {
+                        // このボタンを押した時の処理を書きます。
+                    }
+                })
+                .setNegativeButton("キャンセル", null);
+        return builder.create();
+    }
+}