diff --git a/README.md b/README.md
index f138acc0f..3ab03f6d0 100644
--- a/README.md
+++ b/README.md
@@ -48,7 +48,7 @@ Dojo 情報は次の手順で簡単に更新できます。
 以上で完了です。提案された修正はメンテナーによってチェックされ、問題なければ提案された内容が反映されます。もし問題があってもメンテナー側で気付いて修正できるので、まずはお気軽に提案してみてください :wink:
 
 > [!NOTE]
-> https://coderdojo.jp/docs にあるドキュメントの編集方法も同様です。[db/docs](https://github.com/coderdojo-japan/coderdojo.jp/tree/main/db/docs)ディレクトリをブラウザで開き、修正したいファイルをクリックして、修正内容を提案してください。同ディレクトページの右上にある `Create new file` ボタンをクリックすると、新しいドキュメントの追記を提案することもできます。
+> https://coderdojo.jp/docs にあるドキュメントの編集方法も同様です。[public/docs](https://github.com/coderdojo-japan/coderdojo.jp/tree/main/public/docs)ディレクトリをブラウザで開き、修正したいファイルをクリックして、修正内容を提案してください。同ディレクトページの右上にある `Create new file` ボタンをクリックすると、新しいドキュメントの追記を提案することもできます。
 
 
 <div id='howto-update-kata'></div><br>
diff --git a/app/models/document.rb b/app/models/document.rb
index 66ace8fab..2bac3899c 100644
--- a/app/models/document.rb
+++ b/app/models/document.rb
@@ -1,7 +1,7 @@
 class Document
   attr_reader :id, :filename
-  DIR_PATH = 'db/docs'
-  URL_PATH = 'docs'
+  DIR_PATH = 'public/docs'
+  URL_PATH = '/docs'
 
   class << self
     def all
@@ -33,7 +33,7 @@ def updated_at
       return "2020-02-02T12:34:56+09:00" unless Rails.env.production?
 
       # Call GitHub API in Production
-      uri  = URI.parse("https://api.github.com/repos/coderdojo-japan/coderdojo.jp/commits?path=db/docs/&per_page=1")
+      uri  = URI.parse("https://api.github.com/repos/coderdojo-japan/coderdojo.jp/commits?path=public/docs/&per_page=1")
       json = Net::HTTP.get(uri)
       data = JSON.parse(json)
 
@@ -52,7 +52,7 @@ def updated_at
   end
 
   def url
-    "/#{URL_PATH}/#{self.filename}"
+    "#{URL_PATH}/#{self.filename}"
   end
 
   def exists?
diff --git a/config/initializers/mime_types.rb b/config/initializers/mime_types.rb
index dc1899682..23e3a6fd0 100644
--- a/config/initializers/mime_types.rb
+++ b/config/initializers/mime_types.rb
@@ -2,3 +2,7 @@
 
 # Add new mime types for use in respond_to blocks:
 # Mime::Type.register "text/richtext", :rtf
+
+# MarkdownファイルのMIMEタイプを設定
+Mime::Type.register 'text/markdown', :md, %w( text/plain )
+Rack::Mime::MIME_TYPES['.md'] = 'text/markdown; charset=utf-8'
diff --git a/db/docs/_about-coderdojo-japan-2017.md b/public/docs/_about-coderdojo-japan-2017.md
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