diff --git a/docker/app/Dockerfile.dev b/docker/app/Dockerfile.dev
index d8b933b..e219dd4 100644
--- a/docker/app/Dockerfile.dev
+++ b/docker/app/Dockerfile.dev
@@ -9,7 +9,6 @@ RUN apt-get update -qq && \
     curl \
     && rm -rf /var/lib/apt/lists/*
 
-
 WORKDIR /digichat
 
 RUN chown -R node:node ./
@@ -25,5 +24,24 @@ RUN if git config --global --get gpg.ssh.program; then \
         git config --global --unset gpg.ssh.program; \
     fi
 
+# スクリプトの実行権限を付与
+COPY --chown=node:node scripts/create-admin-user.sh /digichat/scripts/
+RUN chmod +x /digichat/scripts/create-admin-user.sh
+
+# 起動スクリプトの作成
+RUN echo '#!/bin/bash\n\
+# アプリケーションの起動\n\
+pnpm dev &\n\
+\n\
+# アプリケーションの起動を待機\n\
+echo "Waiting for application to start..."\n\
+sleep 10\n\
+\n\
+# 管理者ユーザーの作成\n\
+/digichat/scripts/create-admin-user.sh\n\
+\n\
+# フォアグラウンドプロセスの維持\n\
+wait' > /digichat/start.sh && chmod +x /digichat/start.sh
+
 # コンテナ起動時のコマンド
-CMD ["/bin/bash"]
\ No newline at end of file
+CMD ["/digichat/start.sh"]
diff --git a/docker/db/Dockerfile.dev b/docker/db/Dockerfile.dev
index d17c699..e2ef8fd 100644
--- a/docker/db/Dockerfile.dev
+++ b/docker/db/Dockerfile.dev
@@ -1,4 +1,4 @@
 FROM postgres:17.2-bookworm
 RUN apt-get update && apt-get install -y locales && rm -rf /var/lib/apt/lists/* \
     && localedef -i ja_JP -c -f UTF-8 -A /usr/share/locale/locale.alias ja_JP.UTF-8
-ENV LANG ja_JP.utf8
\ No newline at end of file
+ENV LANG ja_JP.utf8
diff --git a/package.json b/package.json
index cce8e9d..1cd188b 100644
--- a/package.json
+++ b/package.json
@@ -9,7 +9,8 @@
     "format": "prettier --write \"./src/**/*.{ts,tsx}\"",
     "lint": "eslint",
     "stylelint": "stylelint \"./src/**/*.css\" --fix",
-    "seed": "npx prisma migrate reset --force & npx tsx ./prisma/seed/init.ts"
+    "seed": "npx prisma migrate reset --force & npx tsx ./prisma/seed/init.ts",
+    "create-admin-user": "bash ./scripts/create-admin-user.sh"
   },
   "dependencies": {
     "@auth/prisma-adapter": "^2.8.0",
diff --git a/scripts/create-admin-user.sh b/scripts/create-admin-user.sh
new file mode 100644
index 0000000..76c5b85
--- /dev/null
+++ b/scripts/create-admin-user.sh
@@ -0,0 +1,23 @@
+#!/bin/bash
+
+# 環境変数の確認
+if [ -z "$ADMIN_EMAIL" ]; then
+    echo "❌エラー: 環境変数`ADMIN_EMAIL`が設定されていません"
+    exit 1
+fi
+
+# ユーザー名とスラッグの生成
+ADMIN_NAME="Admin User"
+ADMIN_SLUG=$(echo $ADMIN_EMAIL | cut -d@ -f1)
+
+# APIリクエストの実行
+curl -X POST http://localhost:3000/api/ext/users/create \
+  -H "Content-Type: application/json" \
+  -H "Authorization: ${EXT_API_SECRET}" \
+  -d "{
+    \"name\": \"${ADMIN_NAME}\",
+    \"email\": \"${ADMIN_EMAIL}\",
+    \"slug\": \"${ADMIN_SLUG}\"
+  }"
+
+echo "✅テスト用管理者ユーザーの作成が完了しました"