diff --git a/assets/css/member.css b/assets/css/member.css
index 14a90f4f..35bd7936 100644
--- a/assets/css/member.css
+++ b/assets/css/member.css
@@ -27,6 +27,25 @@
   color: var(--gray800);
 }
 
+.form__input-box .error-msg {
+  margin-top: var(--space-xxs);
+  padding: 0 var(--space-xs);
+  font-size: 14px;
+}
+
+/* validation 실패시 */
+.form__input-box.isError .input {
+  border-color: var(--error);
+}
+.form__input-box.isError .error-msg {
+  color: var(--error);
+}
+
+/* validation 통과시 */
+.form__input-box.isValid .input {
+  border-color: var(--primary-color);
+}
+
 /* 비밀번호 인풋박스박스 */
 .form__input-box-pw .input-box__input {
   position: relative;
diff --git a/assets/css/variables.css b/assets/css/variables.css
index 0681cd48..c1dc768f 100644
--- a/assets/css/variables.css
+++ b/assets/css/variables.css
@@ -14,6 +14,7 @@
   --gray700: #374151;
   --gray800: #1f2937;
   --gray900: #111827;
+  --error: #f74747;
 
   /* space */
   --space-xxs: 8px;
diff --git a/assets/js/member.js b/assets/js/member.js
new file mode 100644
index 00000000..5dc1ef0f
--- /dev/null
+++ b/assets/js/member.js
@@ -0,0 +1,137 @@
+// 에러 메세지 생성 함수
+const formEl = document.querySelector(".member-box__form");
+const submitBtn = document.querySelector(".member-box__form .form__submitBtn");
+
+// 빈값일 때 메세지 지정
+const EMPTY_MSG = {
+  nickname: "닉네임을 입력해주세요.",
+  email: "이메일을 입력해주세요.",
+  password: "비밀번호를 입력해주세요.",
+  passwordConfirm: "비밀번호를 입력해주세요.",
+};
+
+// validation 규칙
+const VALIDATION_RULE = {
+  nickname: {
+    isValid: function (value) {
+      return !!value.length;
+    },
+    failedMsg: null,
+  },
+  email: {
+    isValid: function (value) {
+      const PATTERN =
+        /^[0-9a-zA-Z]([-_\.]?[0-9a-zA-Z])*@[0-9a-zA-Z]([-_\.]?[0-9a-zA-Z])*\.[a-zA-Z]{2,3}$/;
+      return PATTERN.test(value);
+    },
+    failedMsg: "잘못된 이메일 형식입니다.",
+  },
+  password: {
+    isValid: function (value) {
+      const PATTERN = /^[0-9a-zA-Z]{8}/;
+      return PATTERN.test(value);
+    },
+    failedMsg: "비밀번호를 8자 이상 입력해주세요.",
+  },
+  passwordConfirm: {
+    isValid: function (value) {
+      const password = document.querySelector("#password");
+      return password.value === value;
+    },
+    failedMsg: "비밀번호가 일치하지 않습니다.",
+  },
+};
+
+// 에러 메세지 생성
+function createErrorMsg(text, inputBox) {
+  // 에러 메세지 중복 생성 방지
+  if (inputBox.querySelector(".error-msg")) return;
+
+  const msg = document.createElement("p");
+  msg.textContent = text;
+  msg.classList.add("error-msg");
+  inputBox.classList.add("isError");
+  inputBox.append(msg);
+}
+
+// input에 값 입력시 isError / isValid 초기화
+function changeInputReset(e) {
+  const inputBox = e.target.closest(".form__input-box");
+
+  if (inputBox.classList.contains("isError")) {
+    inputBox.classList.remove("isError");
+    inputBox.querySelector(".error-msg").remove();
+  }
+
+  if (inputBox.classList.contains("isValid")) {
+    inputBox.classList.remove("isValid");
+  }
+}
+
+// 페이지내의 전체 input validation 통과했는지 확인
+function checkAllPass() {
+  const inputs = document.querySelectorAll(".member-box__form .input");
+  const isAllPass = Array.from(inputs).every((input) =>
+    input.closest(".form__input-box").classList.contains("isValid")
+  );
+
+  submitBtn.disabled = !isAllPass;
+}
+
+// 빈값 검사
+function checkEmpty(name, inputBox) {
+  if (!EMPTY_MSG[name]) return; // EMPTY_MSG에 유효한 값이 있는지 확인
+
+  createErrorMsg(EMPTY_MSG[name], inputBox);
+}
+
+// validation 검사
+function checkValidation(value, name, inputBox) {
+  if (!VALIDATION_RULE[name]) return; // VALIDATION_RULE에 유효한 값이 있는지 확인
+
+  const isValid = VALIDATION_RULE[name].isValid(value); // isValid 검사
+
+  if (!isValid) {
+    // 항목별 validation 실패시
+    createErrorMsg(VALIDATION_RULE[name].failedMsg, inputBox);
+  } else {
+    // 항목별 validation 통과시
+    inputBox.classList.add("isValid");
+  }
+}
+
+// focusout 핸들링 함수
+function handleFocusOut({ target }) {
+  if (!target.classList.contains("input")) return;
+  const { value, name } = target;
+  const inputBox = target.closest(".form__input-box");
+
+  if (!value.length) {
+    // 값이 없으면,
+    checkEmpty(name, inputBox);
+  } else {
+    // 값이 있으면,
+    checkValidation(value, name, inputBox);
+  }
+
+  // 전체 input 유효성 통과헀는지 검사
+  checkAllPass();
+}
+
+function togglePassword(e) {
+  if (!e.target.closest(".input-box__toggle")) return;
+  const pwBox = e.target.closest(".input-box__input");
+  const inputBox = pwBox.querySelector(".input");
+  const isShow = pwBox.classList.contains("pw_show");
+  pwBox.classList.toggle("pw_show");
+  inputBox.setAttribute("type", isShow ? "password" : "text");
+}
+
+function movePage(e) {
+  location.href = e.target.dataset.moveLink;
+}
+
+formEl.addEventListener("input", changeInputReset);
+formEl.addEventListener("focusout", handleFocusOut);
+formEl.addEventListener("click", togglePassword);
+submitBtn.addEventListener("click", movePage);
diff --git a/login.html b/login.html
index 739b9f12..efc3fdf1 100644
--- a/login.html
+++ b/login.html
@@ -35,12 +35,12 @@ <h1 class="logo">
             </div>
           </div>
           <div class="form__input-box form__input-box-pw">
-            <label for="pw" class="input-box__label">비밀번호</label>
+            <label for="password" class="input-box__label">비밀번호</label>
             <div class="input-box__input">
               <input
                 type="password"
-                name="pw"
-                id="pw"
+                name="password"
+                id="password"
                 class="input"
                 placeholder="비밀번호를 입력해주세요."
               />
@@ -57,7 +57,14 @@ <h1 class="logo">
               </button>
             </div>
           </div>
-          <button class="btn lg form__submitBtn">로그인</button>
+          <button
+            type="button"
+            class="btn lg form__submitBtn"
+            disabled
+            data-move-link="/items.html"
+          >
+            로그인
+          </button>
         </form>
         <!-- form :: E -->
         <!-- sns-box :: S -->
@@ -100,5 +107,6 @@ <h2 class="sns-box__title">간편 로그인하기</h2>
         </p>
       </div>
     </div>
+    <script src="./assets/js/member.js"></script>
   </body>
 </html>
diff --git a/signup.html b/signup.html
index 78d950a8..54b982a4 100644
--- a/signup.html
+++ b/signup.html
@@ -46,12 +46,12 @@ <h1 class="logo">
             </div>
           </div>
           <div class="form__input-box form__input-box-pw">
-            <label for="pw" class="input-box__label">비밀번호</label>
+            <label for="password" class="input-box__label">비밀번호</label>
             <div class="input-box__input">
               <input
                 type="password"
-                name="pw"
-                id="pw"
+                name="password"
+                id="password"
                 class="input"
                 placeholder="비밀번호를 입력해주세요."
               />
@@ -69,14 +69,14 @@ <h1 class="logo">
             </div>
           </div>
           <div class="form__input-box form__input-box-pw">
-            <label for="confirm_pw" class="input-box__label"
+            <label for="passwordConfirm" class="input-box__label"
               >비밀번호 확인</label
             >
-            <div class="input-box__input pw_show">
+            <div class="input-box__input">
               <input
                 type="password"
-                name="confirm_pw"
-                id="confirm_pw"
+                name="passwordConfirm"
+                id="passwordConfirm"
                 class="input"
                 placeholder="비밀번호를 한번 더 입력해주세요."
               />
@@ -93,7 +93,14 @@ <h1 class="logo">
               </button>
             </div>
           </div>
-          <button class="btn lg form__submitBtn">회원가입</button>
+          <button
+            type="button"
+            class="btn lg form__submitBtn"
+            disabled
+            data-move-link="/login.html"
+          >
+            회원가입
+          </button>
         </form>
         <!-- form :: E -->
         <!-- sns-box :: S -->
@@ -136,5 +143,6 @@ <h2 class="sns-box__title">간편 로그인하기</h2>
         </p>
       </div>
     </div>
+    <script src="./assets/js/member.js"></script>
   </body>
 </html>