diff --git a/types/is-natural-number/index.d.ts b/types/is-natural-number/index.d.ts
new file mode 100644
index 0000000000..37f8e19a26
--- /dev/null
+++ b/types/is-natural-number/index.d.ts
@@ -0,0 +1,19 @@
+// Type definitions for is-natural-number 4.0
+// Project: https://github.com/shinnn/is-natural-number.js
+// Definitions by:  Adam Zerella <https://github.com/adamzerella>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+interface Options {
+    /**
+     * Setting this option true makes 0 regarded as a natural number.
+     */
+    includeZero: boolean;
+}
+
+/**
+ * Rreturns true if the first argument is one of the natural numbers.
+ * If not, or the argument is not a number, it returns false.
+ */
+declare function isNaturalNumber(number: number|string, option?: Options): boolean;
+
+export = isNaturalNumber;
diff --git a/types/is-natural-number/is-natural-number-tests.ts b/types/is-natural-number/is-natural-number-tests.ts
new file mode 100644
index 0000000000..ac0f0db8eb
--- /dev/null
+++ b/types/is-natural-number/is-natural-number-tests.ts
@@ -0,0 +1,6 @@
+import isNaturalNumber = require("is-natural-number");
+
+isNaturalNumber(5);
+isNaturalNumber("5");
+isNaturalNumber(0, {includeZero: true});
+isNaturalNumber("0", {includeZero: true});
diff --git a/types/is-natural-number/tsconfig.json b/types/is-natural-number/tsconfig.json
new file mode 100644
index 0000000000..0d7327abc4
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+++ b/types/is-natural-number/tsconfig.json
@@ -0,0 +1,25 @@
+{
+    "compilerOptions": {
+      "module": "commonjs",
+      "lib": [
+        "es6"
+      ],
+      "noImplicitAny": true,
+      "noImplicitThis": true,
+      "strictNullChecks": true,
+      "strictFunctionTypes": true,
+      "baseUrl": "../",
+      "typeRoots": [
+        "../"
+      ],
+      "types": [
+
+      ],
+      "noEmit": true,
+      "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+      "index.d.ts",
+      "is-natural-number-tests.ts"
+    ]
+}
diff --git a/types/is-natural-number/tslint.json b/types/is-natural-number/tslint.json
new file mode 100644
index 0000000000..3db14f85ea
--- /dev/null
+++ b/types/is-natural-number/tslint.json
@@ -0,0 +1 @@
+{ "extends": "dtslint/dt.json" }