diff --git a/src/chatwork.js b/src/chatwork.js
new file mode 100644
index 0000000..56fc928
--- /dev/null
+++ b/src/chatwork.js
@@ -0,0 +1,102 @@
+/*!
+ * ChatWork - JavaScript SDK for ChatWork API v1 Preview
+ *
+ * Copyright 2013, Tetsuwo OISHI.
+ * Dual license under the MIT license.
+ * http://tetsuwo.tumblr.com
+ *
+ * Version: 0.0.1
+ * Date: 2013-11-29
+ */
+
+function ChatWork(param) {
+    this.initialize.apply(this, arguments);
+}
+
+ChatWork.prototype.initialize = function(param) {
+    this.apiBaseUrl = 'https://api.chatwork.com/v1';
+    this.name       = '_chatwork';
+    this.times      = 0;
+    this.requests   = [];
+    this.data       = [];
+    this.debug      = false;
+    this.win        = document.defaultView || document.parentWindow;
+
+    this.config = {
+        apiToken: null
+    };
+
+    if (param) {
+        if (param.debug) {
+            this.debug = param.debug;
+        }
+        if (param.apiKey) {
+            this.config.apiToken = param.apiToken;
+        }
+    }
+
+    this.output(param);
+};
+
+ChatWork.prototype.setApiToken = function(val) {
+    this.config.apiToken = val;
+    return this;
+};
+
+ChatWork.prototype.output = function(val) {
+    if (this.debug) {
+        console.log(val);
+    }
+};
+
+ChatWork.prototype.serialize = function(param, prefix) {
+    var query = [];
+
+    for(var p in param) {
+        var k = prefix ? prefix + '[' + p + ']' : p, v = param[p];
+        query.push(
+            typeof v == 'object' ?
+                this.serialize(v, k) :
+                encodeURIComponent(k) + '=' + encodeURIComponent(v)
+        );
+    }
+
+    return query.join('&');
+};
+
+ChatWork.prototype.api = function(method, param, callback) {
+    var callbackName = this.name + '_cb_' + this.times;
+    this.win[callbackName] = callback;
+
+    param = param || {};
+    param.api_key = this.config.apiKey;
+    param.jsonp   = callbackName;
+
+    this.requests[this.times] = {
+        method: method,
+        param: param,
+        callback: callback,
+        callbackName: callbackName
+    };
+
+    if (param.limit === 'all') {
+        param.limit = null;
+    }
+
+    this.times++;
+
+    (function(that, d, t) {
+        var e = d.createElement(t);
+        e.type = 'text/javascript';
+        e.async = true;
+        e.src = that.apiUrl;
+        e.src += method;
+        e.src += '?' + that.serialize(param);
+        that.output(e.src);
+        var s = d.getElementsByTagName(t)[0];
+        s.parentNode.insertBefore(e, s);
+    })(this, document, 'script');
+
+    return this;
+};
+