diff --git a/public/.htaccess b/public/.htaccess
new file mode 100644
index 0000000..7a4704f
--- /dev/null
+++ b/public/.htaccess
@@ -0,0 +1,8 @@
+# htaccess for Astro.js
+ErrorDocument 404 /404.html
+
+# スラッシュの自動補完（ディレクトリ実体がある場合）
+RewriteEngine On
+RewriteCond %{REQUEST_FILENAME} !-f
+RewriteCond %{REQUEST_URI} !(.*)/$
+RewriteRule ^(.*)$ /$1/ [L,R=301]
diff --git a/public/robots.txt b/public/robots.txt
new file mode 100644
index 0000000..1f53798
--- /dev/null
+++ b/public/robots.txt
@@ -0,0 +1,2 @@
+User-agent: *
+Disallow: /