diff --git a/app/beamQuest/main.js b/app/beamQuest/main.js
index 9b1ec25..ff84695 100644
--- a/app/beamQuest/main.js
+++ b/app/beamQuest/main.js
@@ -13,6 +13,7 @@ var SessionStore = {
     }
 };
 
+var ping = require('beamQuest/ping');
 
 exports.start = function(io) {
     var client = SessionStore;
@@ -42,6 +43,8 @@ exports.start = function(io) {
             io.sockets.emit('notify:message', { message: data.message });
         });
 
+        ping.listen(socket);
+
         socket.emit('connected');
     });
 };
diff --git a/app/beamQuest/ping.js b/app/beamQuest/ping.js
new file mode 100644
index 0000000..f750699
--- /dev/null
+++ b/app/beamQuest/ping.js
@@ -0,0 +1,6 @@
+exports.listen = function(socket) {
+    socket.on('ping:update', function(data) {
+        socket.emit('notify:ping', data);
+    });
+};
+
diff --git a/public/cocos2d.js b/public/cocos2d.js
index 68538a3..d35f1d0 100644
--- a/public/cocos2d.js
+++ b/public/cocos2d.js
@@ -25,6 +25,7 @@
             'js/src/inputHandler.js',
             'js/src/entity/entity.js',
             'js/src/entity/player.js',
+            'js/src/ping.js',
             'js/src/beamQuest.js'//add your own files in order here
         ]
     };
diff --git a/public/js/src/beamQuest.js b/public/js/src/beamQuest.js
index 9661a0c..a6b18ea 100755
--- a/public/js/src/beamQuest.js
+++ b/public/js/src/beamQuest.js
@@ -24,6 +24,8 @@ var BeamQuestWorld = cc.Layer.extend({
         this.inputHandler = new InputHandler(bq.player);
         this.baseLayer = baseLayer;
         this.scheduleUpdate();
+
+        this.initPing_();
         return true;
     },
 
@@ -45,6 +47,40 @@ var BeamQuestWorld = cc.Layer.extend({
     /** @override */
     onKeyUp: function(key) {
         this.inputHandler.keyUp(key);
+    },
+
+    initPing_: function() {
+        if (! cc.Director.getInstance().isDisplayStats()) {
+            return;
+        }
+
+        // ping始める
+        var interval = 300;
+        this.ping_ = new bq.Ping(bq.Socket.getInstance().socket, interval);
+        this.ping_.start();
+
+        // 表示用テキストを作る
+        var pingText = function() {
+            return "ping: " + this.ping_.getRoundTripTime();
+        }.bind(this);
+
+        // ラベル作る
+        var fontSize = 16;
+        var pingLabel = bq.Label.createWithShadow(pingText(), fontSize);
+        pingLabel.setAnchorPoint(cc.p(0, 1.0));
+
+        // 表示位置
+        var margin = 5;
+        var winSize = cc.Director.getInstance().getWinSize();
+        pingLabel.setPosition(cc.p(margin, winSize.height - margin));
+
+        // 表示内容更新処理
+        pingLabel.schedule(function() {
+            pingLabel.setString(pingText());
+        });
+
+        var zIndex = 10000;
+        this.addChild(pingLabel, zIndex, bq.config.tags.DEBUG_PING);
     }
 });
 
diff --git a/public/js/src/config.js b/public/js/src/config.js
index f7e051c..1285d7e 100755
--- a/public/js/src/config.js
+++ b/public/js/src/config.js
@@ -15,7 +15,8 @@ var BQConfig = cc.Class.extend({
 
         // Spriteのタグ（IDみたいなの）
         this.tags = {
-            BASE_LAYER: 0
+            BASE_LAYER: 0,
+            DEBUG_PING: 1000000
         }
     }}
 );
diff --git a/public/js/src/ping.js b/public/js/src/ping.js
new file mode 100644
index 0000000..7aa2550
--- /dev/null
+++ b/public/js/src/ping.js
@@ -0,0 +1,42 @@
+bq.Ping = cc.Class.extend({
+    ctor: function(socket, interval) {
+        this.socket_ = socket;
+        this.interval_ = interval;
+        this.roundTripTime_ = 0;
+        this.isRunning_ = false;
+    },
+
+    start: function() {
+        this.isRunning_ = true;
+        this.sendPing_();
+    },
+
+    stop: function() {
+        this.isRunning_ = false;
+    },
+
+    isRunning: function() {
+        return this.isRunning_;
+    },
+
+    getRoundTripTime: function() {
+        return this.roundTripTime_;
+    },
+
+    sendPing_: function() {
+        this.socket_.once('notify:ping', this.onNotifyPing_.bind(this));
+        this.socket_.emit('ping:update', {time: this.now_()});
+    },
+
+    onNotifyPing_: function(data) {
+        this.roundTripTime_ = this.now_() - data.time;
+        if (this.isRunning_) {
+            setTimeout(this.sendPing_.bind(this), this.interval_);
+        }
+    },
+
+    now_: function() {
+        return new Date().getTime();
+    }
+});
+