diff --git a/react-portal/index.d.ts b/react-portal/index.d.ts
new file mode 100644
index 0000000000..2d4bd8721e
--- /dev/null
+++ b/react-portal/index.d.ts
@@ -0,0 +1,25 @@
+// Type definitions for react-portal 3.0
+// Project: https://github.com/tajo/react-portal#readme
+// Definitions by: Shun Takahashi <https://github.com/shuntksh>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.1
+
+import * as React from "react";
+
+interface CallBackProps extends React.Props<any> {
+    closePortal: () => {};
+}
+
+interface ReactPortalProps {
+    isOpened?: boolean;
+    openByClickOn?: React.ReactElement<CallBackProps>;
+    closeOnEsc?: boolean;
+    closeOnOutsideClick?: boolean;
+    onOpen?: (node: HTMLDivElement) => {};
+    beforeClose?: (node: HTMLDivElement, resetPortalState: () => void) => {};
+    onClose?: () => {};
+    onUpdate?: () => {};
+}
+
+declare const ReactPortal: React.ComponentClass<ReactPortalProps>;
+export = ReactPortal;
diff --git a/react-portal/react-portal-tests.tsx b/react-portal/react-portal-tests.tsx
new file mode 100644
index 0000000000..b192e297c7
--- /dev/null
+++ b/react-portal/react-portal-tests.tsx
@@ -0,0 +1,34 @@
+// Example from https://github.com/tajo/react-portal
+import * as React from "react";
+import * as ReactDOM from "react-dom";
+import * as Portal from "react-portal";
+
+export default class App extends React.Component<{}, {}> {
+
+  render() {
+    const button1 = <button>Open portal with pseudo modal</button>;
+
+    return (
+      <Portal closeOnEsc closeOnOutsideClick openByClickOn={button1}>
+        <PseudoModal>
+          <h2>Pseudo Modal</h2>
+          <p>This react component is appended to the document body.</p>
+        </PseudoModal>
+      </Portal>
+    );
+  }
+
+}
+
+export class PseudoModal extends React.Component<{ closePortal?: () => {} }, {}> {
+  render() {
+    return (
+      <div>
+        {this.props.children}
+        <p><button onClick={this.props.closePortal}>Close this</button></p>
+      </div>
+    );
+  }
+}
+
+ReactDOM.render(<App />, document.getElementById('react-body'));
\ No newline at end of file
diff --git a/react-portal/tsconfig.json b/react-portal/tsconfig.json
new file mode 100644
index 0000000000..9b28b70ac3
--- /dev/null
+++ b/react-portal/tsconfig.json
@@ -0,0 +1,25 @@
+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "target": "es6",
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true,
+        "lib": [
+            "es6",
+            "dom"
+        ],
+        "jsx": "react"
+    },
+    "files": [
+        "index.d.ts",
+        "react-portal-tests.tsx"
+    ]
+}
diff --git a/react-portal/tslint.json b/react-portal/tslint.json
new file mode 100644
index 0000000000..377cc837d4
--- /dev/null
+++ b/react-portal/tslint.json
@@ -0,0 +1 @@
+{ "extends": "../tslint.json" }