diff --git a/src/index.ts b/src/index.ts
index c79488a..3fa98d4 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -147,6 +147,22 @@ export const max =
     }
   };
 
+export const minLength =
+  (min: number): CheckerFn<string> =>
+  (t, val) => {
+    if (val.length < min) {
+      return t('minLength', { min });
+    }
+  };
+
+export const maxLength =
+  (max: number): CheckerFn<string> =>
+  (t, val) => {
+    if (val.length > max) {
+      return t('maxLength', { max });
+    }
+  };
+
 export const email: CheckerFn<string> = (t, val) => {
   // eslint-disable-next-line max-len
   const emailRE =
diff --git a/test/rules.test.ts b/test/rules.test.ts
index 1243c2b..4bd2db9 100644
--- a/test/rules.test.ts
+++ b/test/rules.test.ts
@@ -11,6 +11,8 @@ import {
   different,
   min,
   max,
+  minLength,
+  maxLength,
   email,
   accepted,
 } from '../src';
@@ -174,6 +176,28 @@ describe('Rule: max', () => {
   });
 });
 
+describe('Rule: minLength', () => {
+  it('Error case', () => {
+    expect(minLength(6)(t, '1234')).toBeDefined();
+  });
+
+  it('Valid case', () => {
+    expect(minLength(3)(t, '1234')).toBeUndefined();
+    expect(minLength(4)(t, '1234')).toBeUndefined();
+  });
+});
+
+describe('Rule: maxLength', () => {
+  it('Error case', () => {
+    expect(maxLength(3)(t, '1234')).toBeDefined();
+  });
+
+  it('Valid case', () => {
+    expect(maxLength(6)(t, '123456')).toBeUndefined();
+    expect(maxLength(4)(t, '1234')).toBeUndefined();
+  });
+});
+
 describe('Rule: email', () => {
   it('Error case', () => {
     expect(email(t, 'not email value')).toBeDefined();