diff --git a/Gemfile.lock b/Gemfile.lock
index cb1bcb126..2c791faef 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    github-services (1.0.0.f39cad6)
+    github-services (1.0.0.0778ac6)
       activeresource (~> 4.0.0)
       addressable (~> 2.2.7)
       aws-sdk (~> 1.27)
diff --git a/docs/chatwork b/docs/chatwork
new file mode 100644
index 000000000..2a0048de3
--- /dev/null
+++ b/docs/chatwork
@@ -0,0 +1,25 @@
+Beyond chat. Beyond simple. Text, voice, video, task management, and file sharing all in one place.
+
+http://chatwork.com/
+
+If you want to see detailed repo activity in your room, follow this steps:
+
+  - Click the **Settings Cog** on the top right
+  - Click on **Integrations**
+  - Select **GitHub**
+  - Click on **configure manually** option
+  - Copy and paste the provided token here
+
+Install Notes
+-------------
+
+http://chatwork.com
+
+1. **Token** - Enter your API Token.
+2. **Rooms** - Enter a comma delimited set of Room ID.
+
+Options
+
+3. **Mute push** - Mute push notifications.
+4. **Mute pull request** - Mute pull request notifications.
+5. **Mute issues** - Mute issues notifications.
diff --git a/lib/services/chatwork.rb b/lib/services/chatwork.rb
new file mode 100644
index 000000000..63834d368
--- /dev/null
+++ b/lib/services/chatwork.rb
@@ -0,0 +1,83 @@
+class Service::ChatWork < Service
+  string          :rooms, :restrict_to_branch
+  password        :token
+  boolean         :mute_push, :mute_pull_request, :mute_issues
+  white_list      :rooms, :restrict_to_branch
+
+  default_events  :push, :pull_request, :issues
+
+  maintained_by github: 'chatwork'
+  supported_by  github: 'chatwork'
+
+  url       'http://www.chatwork.com/'
+  logo_url  'http://www.chatwork.com/image/common/logo_hz.png'
+
+  def receive_push
+    required_config
+    if config_boolean_true? 'mute_push'
+      return
+    end
+
+    branch_restriction = data['restrict_to_branch'].to_s
+    if branch_restriction.length > 0 && branch_restriction.index(branch) == nil
+      return
+    end
+
+    message = <<-EOH
+[info][title]#{pusher_name} has pushed #{commits.size} commit(s)[/title]#{commit_messages.join("\n")}
+[hr]Branch: #{branch_name}
+Repository: #{repo_name}
+Compare: #{compare_url}[/info]
+EOH
+    send message
+  end
+
+  def receive_pull_request
+    required_config
+    if config_boolean_true? 'mute_pull_request'
+      return
+    end
+
+    message = <<-EOH
+[info][title]#{action} a pull request. #{pull.title}[/title]#{summary_message}
+[hr]URL: #{summary_url}[/info]
+EOH
+    send message
+  end
+
+  def receive_issues
+    required_config
+    return if config_boolean_true? 'mute_issues'
+
+    message = <<-EOH
+[info][title]#{action} an issue. #{issue.title}[/title]#{summary_message}
+[hr]URL: #{summary_url}[/info]
+EOH
+    send message
+  end
+
+  private
+
+  def required_config
+    raise_config_error 'Token is required' if data['token'].to_s.empty?
+    raise_config_error 'rooms is required' if data['rooms'].to_s.empty?
+  end
+
+  def send(message)
+    http.url_prefix = 'https://api.chatwork.com'
+    http.headers['X-ChatWorkToken'] = data['token']
+    http.headers['X-GitHub-Event']  = event.to_s
+    http.headers['Content-Type']    = 'application/json'
+    http.headers['Accept']          = 'application/json'
+
+    rooms = data['rooms'].to_s.split(',')
+    rooms.each do |room_id|
+      response = http_post "/v1/rooms/#{room_id}/messages", :body => message
+      case response.status
+        when 200..299
+        else raise_config_error "HTTP Error: #{response.status} #{response.body}"
+      end
+    end
+  end
+
+end
diff --git a/test/chatwork_test.rb b/test/chatwork_test.rb
new file mode 100644
index 000000000..ae9559be7
--- /dev/null
+++ b/test/chatwork_test.rb
@@ -0,0 +1,56 @@
+require File.expand_path('../helper', __FILE__)
+
+class ChatWorkTest < Service::TestCase
+  def setup
+    @stubs  = Faraday::Adapter::Test::Stubs.new
+    @token  = 'TOooooooooooooooooooooooooooOKEN'
+    @roomid = 'ROOM_ID'
+    @config = {
+      "token" => @token,
+      "rooms" => @roomid
+    }
+  end
+
+  def test_push
+    @stubs.post "/v1/rooms/#{@roomid}/messages" do |env|
+      assert_equal 'api.chatwork.com',  env[:url].host
+      assert_equal 'https',             env[:url].scheme
+      assert_equal 'application/json',  env[:request_headers]['Content-Type']
+      assert_equal 'push',              env[:request_headers]['X-GitHub-Event']
+      assert_equal :post,               env[:method]
+      [200, {}, '']
+    end
+
+    service(:push, @config).receive_push
+  end
+
+  def test_pull
+    @stubs.post "/v1/rooms/#{@roomid}/messages" do |env|
+      assert_equal 'api.chatwork.com',  env[:url].host
+      assert_equal 'https',             env[:url].scheme
+      assert_equal 'application/json',  env[:request_headers]['Content-Type']
+      assert_equal 'pull_request',      env[:request_headers]['X-GitHub-Event']
+      assert_equal :post,               env[:method]
+      [200, {}, '']
+    end
+
+    service(:pull_request, @config).receive_pull_request
+  end
+
+  def test_issues
+    @stubs.post "/v1/rooms/#{@roomid}/messages" do |env|
+      assert_equal 'api.chatwork.com',  env[:url].host
+      assert_equal 'https',             env[:url].scheme
+      assert_equal 'application/json',  env[:request_headers]['Content-Type']
+      assert_equal 'issues',            env[:request_headers]['X-GitHub-Event']
+      assert_equal :post,               env[:method]
+      [200, {}, '']
+    end
+
+    service(:issues, @config).receive_issues
+  end
+
+  def service(*args)
+    super Service::ChatWork, *args
+  end
+end