diff --git a/types/moji/index.d.ts b/types/moji/index.d.ts
new file mode 100644
index 0000000000..ae45f6ac26
--- /dev/null
+++ b/types/moji/index.d.ts
@@ -0,0 +1,32 @@
+// Type definitions for moji 0.5
+// Project: https://github.com/niwaringo/moji
+// Definitions by: Yasunori Ohoka <https://github.com/yasupeke>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.4
+
+declare namespace moji {
+  type Mojisyu = "ZE" | "HE" | "ZS" | "HS" | "HG" | "KK" | "ZK" | "HK";
+
+  interface MojisyuRange {
+    start: number;
+    end: number;
+  }
+
+  interface MojisyuRegExp {
+    regexp: RegExp;
+    list: string[];
+  }
+
+  interface Moji {
+    convert(beforeType: Mojisyu, afterType: Mojisyu): Moji;
+    trim(): Moji;
+    filter(type: Mojisyu): Moji;
+    reject(type: Mojisyu): Moji;
+    toString(): string;
+  }
+
+  function addMojisyu(type: string, mojisyu: MojisyuRange | MojisyuRegExp): void;
+}
+
+declare function moji(moji: string): moji.Moji;
+export = moji;
diff --git a/types/moji/moji-tests.ts b/types/moji/moji-tests.ts
new file mode 100644
index 0000000000..05be3e43c1
--- /dev/null
+++ b/types/moji/moji-tests.ts
@@ -0,0 +1,23 @@
+import moji = require('moji');
+
+moji('ＡＢＣＤ０１２３４').convert('ZE', 'HE').toString();
+moji('ABCD01234').convert('HE', 'ZE').toString();
+// tslint:disable-next-line:no-irregular-whitespace
+moji('　').convert('ZS', 'HS').toString();
+moji('あいうえお').convert('HG', 'KK').toString();
+moji('アイウエオ').convert('KK', 'HG').toString();
+moji('アイウエオ').convert('ZK', 'HK').toString();
+moji('ｱｲｳｴｵ').convert('HK', 'ZK').toString();
+moji('ｱｲｳｴｵ').convert('HK', 'ZK').convert('KK', 'HG').toString();
+
+moji(' ｱｲｳｴｵ ').trim().toString();
+
+moji('abcあいうアイウ123').filter('HG').toString();
+
+moji('abcあいうアイウ123').reject('HG').toString();
+
+moji.addMojisyu('ZE', { start: 0xff01, end: 0xff5e });
+moji.addMojisyu('HK', {
+  regexp: /([\uff66-\uff9c]\uff9e)|([\uff8a-\uff8e]\uff9f)|([\uff61-\uff9f])/g,
+  list: ["｡", "｢", "｣"]
+});
diff --git a/types/moji/tsconfig.json b/types/moji/tsconfig.json
new file mode 100644
index 0000000000..a6b2e51f26
--- /dev/null
+++ b/types/moji/tsconfig.json
@@ -0,0 +1,24 @@
+{
+    "compilerOptions": {
+      "module": "commonjs",
+      "target": "es6",
+      "lib": [
+        "es6"
+      ],
+      "noImplicitAny": true,
+      "noImplicitThis": true,
+      "strictNullChecks": true,
+      "strictFunctionTypes": true,
+      "baseUrl": "../",
+      "typeRoots": [
+        "../"
+      ],
+      "types": [],
+      "noEmit": true,
+      "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+      "index.d.ts",
+      "moji-tests.ts"
+    ]
+}
diff --git a/types/moji/tslint.json b/types/moji/tslint.json
new file mode 100644
index 0000000000..3db14f85ea
--- /dev/null
+++ b/types/moji/tslint.json
@@ -0,0 +1 @@
+{ "extends": "dtslint/dt.json" }