diff --git a/chrome/chrome-app.d.ts b/chrome/chrome-app.d.ts
index ad319394f..e82de28b2 100644
--- a/chrome/chrome-app.d.ts
+++ b/chrome/chrome-app.d.ts
@@ -1,6 +1,6 @@
 // Type definitions for Chrome packaged application development
 // Project: http://developer.chrome.com/apps/
-// Definitions by: Adam Lay <https://github.com/AdamLay>
+// Definitions by: Adam Lay <https://github.com/AdamLay>, MIZUNE Pine <https://github.com/pine613>
 // Definitions: https://github.com/borisyankov/DefinitelyTyped
 
 ////////////////////
@@ -93,3 +93,189 @@ declare module chrome.app.window {
     var onMinimized: WindowEvent;
     var onRestored: WindowEvent;
 }
+
+
+////////////////////
+// Sockets
+////////////////////
+declare module chrome.sockets.tcp {
+    interface CreateInfo {
+        socketId: number;
+    }
+
+    interface SendInfo {
+        resultCode: number;
+        bytesSent?: number;
+    }
+
+    interface Event<T> {
+        addListener(callback: (info: T) => void): void;
+    }
+
+    interface ReceiveEventArgs {
+        socketId: number;
+        data: ArrayBuffer;
+    }
+
+    interface ReceiveErrorEventArgs {
+        socketId: number;
+        resultCode: number;
+    }
+
+    interface SocketProperties {
+        persistent?: boolean;
+        name?: string;
+        bufferSize?: number;
+    }
+
+    interface SocketInfo {
+        socketId: number;
+        persistent: boolean;
+        name?: string;
+        bufferSize?: number;
+        paused: boolean;
+        connected: boolean;
+        localAddress?: string;
+        localPort?: number;
+        peerAddress?: string;
+        peerPort?: number;
+    }
+
+    export function create(callback: (createInfo: CreateInfo) => void): void;
+    export function create(properties: SocketProperties, callback: (createInfo: CreateInfo) => void): void;
+
+    export function update(socketId: number, properties: SocketProperties, callback?: () => void): void;
+    export function setPaused(socketId: number, paused: boolean, callback: () => void): void;
+
+    export function setKeepAlive(socketId: number,
+        enable: boolean, callback: (result: number) => void): void;
+    export function setKeepAlive(socketId: number,
+        enable: boolean, delay: number, callback: (result: number) => void): void;
+
+    export function setNoDelay(socketId: number,
+        peerAddress: string, peerPort: number, callback: (result: number) => void): void;
+    export function disconnect(socketId: number, callback?: () => void): void;
+    export function send(socketId: number, data: ArrayBuffer, callback: (sendInfo: SendInfo) => void): void;
+    export function close(socketId: number, callback?: () => void): void;
+    export function getInfo(socketId: number, callback: (socketInfo: SocketInfo) => void): void;
+    export function getSockets(socketId: number, callback: (socketInfos: SocketInfo[]) => void): void;
+
+    var onReceive: Event<ReceiveEventArgs>;
+    var onReceiveError: Event<ReceiveErrorEventArgs>;
+}
+
+declare module chrome.sockets.udp {
+    interface CreateInfo {
+        socketId: number;
+    }
+
+    interface SendInfo {
+        resultCode: number;
+        bytesSent?: number;
+    }
+
+    interface Event<T> {
+        addListener(callback: (info: T) => void): void;
+    }
+
+    interface ReceiveEventArgs {
+        socketId: number;
+        data: ArrayBuffer;
+        remoteAddress: string;
+        remotePort: number;
+    }
+
+    interface ReceiveErrorEventArgs {
+        socketId: number;
+        resultCode: number;
+    }
+
+    interface SocketProperties {
+        persistent?: boolean;
+        name?: string;
+        bufferSize?: number;
+    }
+
+    interface SocketInfo {
+        socketId: number;
+        persistent: boolean;
+        name?: string;
+        bufferSize?: number;
+        paused: boolean;
+        connected: boolean;
+        localAddress?: string;
+        localPort?: number;
+    }
+
+    export function create(callback: (createInfo: CreateInfo) => void): void;
+    export function create(properties: SocketProperties,
+        callback: (createInfo: CreateInfo) => void): void;
+
+    export function update(socketId: number, properties: SocketProperties, callback?: () => void): void;
+    export function setPaused(socketId: number, paused: boolean, callback?: () => void): void;
+    export function bind(socketId: number, address: string, port: number, callback: (result: number) => void): void;
+    export function send(socketId: number, data: ArrayBuffer, address: string, port: number, callback: (sendInfo: SendInfo) => void): void;
+    export function close(socketId: number, callback?: () => void): void;
+    export function getInfo(socketId: number, callback: (socketInfo: SocketInfo) => void): void;
+    export function getSockets(callback: (socketInfos: SocketInfo[]) => void): void;
+    export function joinGroup(socketId: number, address: string, callback: (result: number) => void): void;
+    export function leaveGroup(socketId: number, address: string, callback: (result: number) => void): void;
+    export function setMulticastTimeToLive(socketId: number, ttl: number, callback: (result: number) => void): void;
+    export function setMulticastLoopbackMode(socketId: number, enabled: boolean, callback: (result: number) => void): void;
+    export function getJoinedGroups(socketId: number, callback: (groups: string[]) => void): void;
+
+    var onReceive: Event<ReceiveEventArgs>;
+    var onReceiveError: Event<ReceiveErrorEventArgs>;
+}
+
+declare module chrome.sockets.tcpServer {
+    interface CreateInfo {
+        socketId: number;
+    }
+
+    interface Event<T> {
+        addListener(callback: (info: T) => void): void;
+    }
+
+    interface AcceptEventArgs {
+        socketId: number;
+        clientSocketId: number;
+    }
+
+    interface AcceptErrorEventArgs {
+        socketId: number;
+        resultCode: number;
+    }
+
+    interface SocketProperties {
+        persistent?: boolean;
+        name?: string;
+    }
+
+    interface SocketInfo {
+        socketId: number;
+        persistent: boolean;
+        name?: string;
+        paused: boolean;
+        localAddress?: string;
+        localPort?: number;
+    }
+
+    export function create(callback: (createInfo: CreateInfo) => void): void;
+    export function create(properties: SocketProperties, callback: (createInfo: CreateInfo) => void): void;
+
+    export function update(socketId: number, properties: SocketProperties, callback?: () => void): void;
+    export function setPaused(socketId: number, paused: boolean, callback: () => void): void;
+
+    export function listen(socketId: number, address: string,
+        port: number, backlog: number, callback: (result: number) => void): void;
+    export function listen(socketId: number, address: string,
+        port: number, callback: (result: number) => void): void;
+
+    export function disconnect(socketId: number, callback?: () => void): void;
+    export function close(socketId: number, callback?: () => void): void;
+    export function getInfo(socketId: number, callback: (socketInfos: SocketInfo[]) => void): void;
+
+    var onAccept: Event<AcceptEventArgs>;
+    var onAcceptError: Event<AcceptErrorEventArgs>;
+}
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