diff --git a/Casks/firefox-beta-ja.rb b/Casks/firefox-beta-ja.rb
new file mode 100644
index 000000000..93180cce6
--- /dev/null
+++ b/Casks/firefox-beta-ja.rb
@@ -0,0 +1,7 @@
+class FirefoxBetaJa < Cask
+  url 'https://download.mozilla.org/?product=firefox-31.0b1&os=osx&lang=ja-JP-mac'
+  homepage 'http://www.mozilla.org/ja/firefox/channel/#beta'
+  version '31.0b1'
+  sha256 '7847e1aa50394d84bbe62cb5a9e61dc1f8671da301c174e517afb7049da50177'
+  link 'Firefox.app'
+end