diff --git a/CONTRIBUTORS.md b/CONTRIBUTORS.md
index 4955fcbdb..e51d544d5 100644
--- a/CONTRIBUTORS.md
+++ b/CONTRIBUTORS.md
@@ -272,6 +272,7 @@ All definitions files include a header with the author and editors, so at some p
 * [Platform](https://github.com/bestiejs/platform.js) (by [Jake Hickman](https://github.com/JakeH))
 * [PouchDB](http://pouchdb.com) (by [Bill Sears](https://github.com/MrBigDog2U/))
 * [PreloadJS](http://www.createjs.com/#!/PreloadJS) (by [Pedro Ferreira](https://bitbucket.org/drk4))
+* [ProgressJs](http://usablica.github.io/progress.js/) (by [Shunsuke Ohtani](https://github.com/zaneli))
 * [Q](https://github.com/kriskowal/q) (by Barrie Nemetchek, Andrew Gaspar)
 * [Q-io](https://github.com/kriskowal/q-io) (by [Bart van der Schoor](https://github.com/Bartvds))
 * [QUnit](http://qunitjs.com/) (by [Diullei Gomes](https://github.com/Diullei))
diff --git a/progressjs/progress-tests.ts b/progressjs/progress-tests.ts
new file mode 100644
index 000000000..e2ab62f9a
--- /dev/null
+++ b/progressjs/progress-tests.ts
@@ -0,0 +1,36 @@
+/// <reference path="progress.d.ts"/>
+
+progressJs(); //without selector, set progress-bar for whole page
+progressJs("#targetElement"); //start progress-bar for element id='targetElement'
+
+progressJs().start();
+
+progressJs().set(20); //set progress to 20%
+
+progressJs().start().autoIncrease(4, 500); //every 500 milliseconds, percentage + 4
+
+progressJs().increase(); //increase one percent
+progressJs().increase(2); //increase two percent
+
+progressJs().start().set(20).end();
+
+progressJs().setOption("theme", "black");
+progressJs().setOption("overlayMode", true);
+progressJs().setOption("considerTransition", false);
+
+progressJs().setOptions({ 'theme': 'black', 'overlayMode': true });
+progressJs().setOptions({ 'theme': 'black', 'overlayMode': true });
+progressJs().setOptions({ 'theme': 'black', 'overlayMode': true, 'considerTransition': false });
+progressJs().setOptions({ 'overlayMode': true });
+
+progressJs().onbeforeend(function() {
+  alert("before end");
+});
+
+progressJs().onbeforestart(function() {
+  alert("before start");
+});
+
+progressJs().onprogress(function(targetElm, percent) {
+  alert("progress changed to:" + percent);
+});
diff --git a/progressjs/progress.d.ts b/progressjs/progress.d.ts
new file mode 100644
index 000000000..a7f9923c3
--- /dev/null
+++ b/progressjs/progress.d.ts
@@ -0,0 +1,103 @@
+// Type definitions for ProgressJs v0.1.0
+// Project: http://usablica.github.io/progress.js/
+// Definitions by: Shunsuke Ohtani <https://github.com/zaneli>
+// Definitions: https://github.com/borisyankov/DefinitelyTyped
+
+interface ProgressJsStatic {
+
+  /**
+   * Creating an ProgressJS object.
+   *
+   * @param targetElm String (optional) Should be defined to start progress-bar for specific element.
+   */
+  (targetElm?: string): ProgressJs;
+}
+
+interface ProgressJs {
+
+  /**
+   * Start the progress-bar for defined element(s).
+   */
+  start(): ProgressJs;
+
+  /**
+   * Set specific percentage to progress-bar.
+   *
+   * @param percent Set to specific percentage.
+   */
+  set(percent: number): ProgressJs;
+
+  /**
+   * Set an auto-increase timer for the progress-bar.
+   *
+   * @param size The size of increment when timer elapsed.
+   * @param millisecond Timer in milliseconds.
+   */
+  autoIncrease(size: number, millisecond: number): ProgressJs;
+
+  /**
+   * Increase the progress-bar bar specified size. Default size is 1.
+   *
+   * @param size The size of increment.
+   */
+  increase(size?: number): ProgressJs;
+
+  /**
+   * End the progress-bar and remove the elements from page.
+   */
+  end(): ProgressJs;
+
+  /**
+   * Set a single option to progressJs object.
+   *
+   * @param option Option key name.
+   * @param value Value of the option.
+   */
+  setOption(option: string, value: string): ProgressJs;
+  setOption(option: string, value: boolean): ProgressJs;
+
+  /**
+   * Set a group of options to the progressJs object.
+   *
+   * @param options Object that contains option keys with values.
+   */
+  setOptions(options: ProgressJsOptions): ProgressJs;
+
+  /**
+   * Set a callback function for before end of the progress-bar.
+   *
+   * @param providedCallback Callback function.
+   */
+  onbeforeend(providedCallback: () => any): ProgressJs;
+
+  /**
+   * Set a callback function to call before start the progress-bar.
+   *
+   * @param providedCallback Callback function.
+   */
+  onbeforestart(providedCallback: () => any): ProgressJs;
+
+  /**
+   * Set callback function to call for each change of progress-bar.
+   *
+   * @param providedCallback Callback function.
+   */
+  onprogress(providedCallback: (targetElement: string, percent: number) => any): ProgressJs;
+}
+
+interface ProgressJsOptions {
+  /**
+   * progress bar theme
+   */
+  theme?: string;
+  /**
+   * overlay mode makes an overlay layer in the target element
+   */
+  overlayMode?: boolean;
+  /**
+   * to consider CSS3 transitions in events
+   */
+  considerTransition?: boolean;
+}
+
+declare var progressJs: ProgressJsStatic