diff --git a/samples/ChatWork.gs b/samples/ChatWork.gs
new file mode 100644
index 00000000..9b03e99f
--- /dev/null
+++ b/samples/ChatWork.gs
@@ -0,0 +1,85 @@
+var CLIENT_ID = '...';
+var CLIENT_SECRET = '...';
+
+/**
+ * Authorizes and makes a request to the ChatWork API.
+ */
+function run() {
+  var service = getService();
+  if (service.hasAccess()) {
+    var response = UrlFetchApp.fetch('https://api.chatwork.com/v2/me', {
+      headers: {
+        Authorization: 'Bearer ' + service.getAccessToken()
+      }
+    });
+    var result = JSON.parse(response.getContentText());
+    Logger.log(JSON.stringify(result, null, 2));
+  } else {
+    var authorizationUrl = service.getAuthorizationUrl();
+    Logger.log('Open the following URL and re-run the script: %s',
+      authorizationUrl);
+  }
+}
+
+/**
+ * Reset the authorization state, so that it can be re-tested.
+ */
+function reset() {
+  var service = getService();
+  service.reset();
+}
+
+/**
+ * Configures the service.
+ */
+function getService() {
+  var scope = 'users.profile.me:read rooms.messages:read';
+  return OAuth2.createService('ChatWork')
+    // Set the endpoint URLs.
+    .setAuthorizationBaseUrl('https://www.chatwork.com/packages/oauth2/login.php')
+    .setTokenUrl('https://oauth.chatwork.com/token')
+
+    // Set the client ID and secret.
+    .setClientId(CLIENT_ID)
+    .setClientSecret(CLIENT_SECRET)
+
+    // Set the name of the callback function that should be invoked to
+    // complete the OAuth flow.
+    .setCallbackFunction('authCallback')
+
+    .setScope(scope)
+
+    .setTokenHeaders({
+      'Authorization': 'Basic ' + Utilities.base64Encode(CLIENT_ID + ':' + CLIENT_SECRET)
+    })
+    // Avoid "invalid_client error".
+    // This service does not support form field authentication.
+    .setTokenPayloadHandler(function(tokenPayload) {
+      delete tokenPayload.client_id;
+      return tokenPayload;
+    })
+    // Set the property store where authorized tokens should be persisted.
+    .setPropertyStore(PropertiesService.getUserProperties())
+  ;
+}
+
+/**
+ * Handles the OAuth callback.
+ */
+function authCallback(request) {
+  var service = getService();
+  var authorized = service.handleCallback(request);
+  if (authorized) {
+    return HtmlService.createHtmlOutput('Success!');
+  } else {
+    return HtmlService.createHtmlOutput('Denied.');
+  }
+}
+
+/**
+ * Logs the redict URI to register.
+ */
+function logRedirectUri() {
+  var service = getService();
+  Logger.log(service.getRedirectUri());
+}