diff --git a/src/polyfill/Number.isInteger.js b/src/polyfill/Number.isInteger.js
new file mode 100644
index 0000000..f419285
--- /dev/null
+++ b/src/polyfill/Number.isInteger.js
@@ -0,0 +1,10 @@
+// References:
+// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isInteger
+
+if (!Number.isInteger)
+{
+    Number.isInteger = function numberIsInteger(value)
+    {
+        return typeof value === 'number' && isFinite(value) && Math.floor(value) === value;
+    };
+}

diff --git a/src/polyfill/Number.isInteger.js b/src/polyfill/Number.isInteger.js
new file mode 100644
index 0000000..f419285
--- /dev/null
+++ b/src/polyfill/Number.isInteger.js
@@ -0,0 +1,10 @@
+// References:
+// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isInteger
+
+if (!Number.isInteger)
+{
+    Number.isInteger = function numberIsInteger(value)
+    {
+        return typeof value === 'number' && isFinite(value) && Math.floor(value) === value;
+    };
+}
diff --git a/src/polyfill/index.js b/src/polyfill/index.js
index d963dee..315e509 100644
--- a/src/polyfill/index.js
+++ b/src/polyfill/index.js
@@ -1,6 +1,7 @@
 import './Object.assign';
 import './requestAnimationFrame';
 import './Math.sign';
+import './Number.isInteger';
 
 if (!window.ArrayBuffer)
 {