diff --git a/src/pages/Auth/Signup.jsx b/src/pages/Auth/Signup.jsx
index 30d5355..fcf7674 100644
--- a/src/pages/Auth/Signup.jsx
+++ b/src/pages/Auth/Signup.jsx
@@ -20,13 +20,28 @@ const Signup = () => {
     birthDate: "",
     role: "",
   });
+  const [showconfirmAccountInfo, setShowconfirmAccountInfo] = useState(false);
+  const [errorMessage, setErrorMessage] = useState("");
+
   const navigate = useNavigate();
 
   const handleChange = (e) => {
+    if (e.target.name === "confirmAccountInfo") {
+      setShowconfirmAccountInfo(true);
+    }
+
+    // if (e.target.name === "birthDate") {
+    //   const formattedValue = e.target.value.replaceAll("-", "");
+    //   setUserData({
+    //     ...userData,
+    //     [e.target.name]: formattedValue,
+    //   });
+    // } else {
     setUserData({
       ...userData,
       [e.target.name]: e.target.value,
     });
+    // }
   };
 
   const handleRoleChange = (role) => {
@@ -37,20 +52,60 @@ const Signup = () => {
   };
 
   const handleNext = () => {
-    setStep(step + 1);
+    let error = "";
+    if (step === 0 && !isNameValid(userData.name)) {
+      error = "이름은 2~5글자 이내의 한글로 입력해주세요.";
+    } else if (step === 1 && !isPhoneNumValid(userData.phoneNum)) {
+      // TODO: 이미 존재하는 전화번호인지도 확인
+      error = "전화번호는 010-XXXX-XXXX 형식으로 입력해주세요.";
+    } else if (step === 2) {
+      if (!isPasswordValid(userData.accountInfo)) {
+        error = "비밀번호는 6자리 숫자로 입력해주세요.";
+      } else if (showconfirmAccountInfo && userData.accountInfo !== userData.confirmAccountInfo) {
+        error = "비밀번호가 일치하지 않습니다.";
+      }
+    } else if (step === 3 && !isBirthDateValid(userData.birthDate)) {
+      error = "생년월일을 올바르게 입력해주세요.";
+    }
+
+    if (error) {
+      setErrorMessage(error);
+    } else {
+      setErrorMessage("");
+      if (step === 2 && !showconfirmAccountInfo) {
+        setShowconfirmAccountInfo(true);
+      } else {
+        setStep(step + 1);
+      }
+    }
   };
 
-  const handleSubmit = (e) => {
-    e.preventDefault();
-    console.log(userData);
-    // TODO: 폼 제출 로직 추가
-    setStep(5);
+  const handleSubmit = () => {
+    let error = "";
+    if (step === 4 && !userData.role) {
+      error = "역할을 선택해주세요.";
+    }
+
+    if (error) {
+      if (step === 4 && !userData.role) {
+        setErrorMessage(error);
+      }
+    } else {
+      console.log(userData);
+      // TODO: 폼 제출 로직 추가
+      setStep(5);
+    }
   };
 
   const handleLoginRedirect = () => {
     navigate("/login");
   };
 
+  const isNameValid = (name) => /^[\uAC00-\uD7A3]{2,5}$/.test(name); // 2~5글자 이내의 한글
+  const isPasswordValid = (password) => /^[0-9]{6}$/.test(password); // 6자리 숫자
+  const isPhoneNumValid = (phoneNum) => /^010-\d{4}-\d{4}$/.test(phoneNum); // 010-0000-0000 형식
+  const isBirthDateValid = (birthDate) => birthDate.replaceAll("-", "").length === 8; // YYYYMMDD 형식
+
   return (
     <Container>
       <FormWrapper>
@@ -60,6 +115,7 @@ const Signup = () => {
             <RightAlignedDiv>
               <Input type="text" name="name" value={userData.name} onChange={handleChange} />
             </RightAlignedDiv>
+            {errorMessage && <ErrorMessage>{errorMessage}</ErrorMessage>}
           </StepWrapper>
         )}
         {step === 1 && (
@@ -68,14 +124,24 @@ const Signup = () => {
             <RightAlignedDiv>
               <Input type="text" name="phoneNum" value={userData.phoneNum} onChange={handleChange} />
             </RightAlignedDiv>
+            {errorMessage && <ErrorMessage>{errorMessage}</ErrorMessage>}
           </StepWrapper>
         )}
         {step === 2 && (
           <StepWrapper>
             <ChatBubble text="비밀번호를 알려주세요!" />
-            <RightAlignedDiv>
-              <Input type="password" name="accountInfo" value={userData.accountInfo} onChange={handleChange} />
+            <RightAlignedDiv tw="mb-10">
+              <Input type="password" name="accountInfo" value={userData.accountInfo} onChange={handleChange} disabled={showconfirmAccountInfo} />
             </RightAlignedDiv>
+            {showconfirmAccountInfo && (
+              <div tw="flex flex-col">
+                <ChatBubble text="비밀번호를 한 번 더 알려주세요!" />
+                <RightAlignedDiv>
+                  <Input type="password" name="confirmAccountInfo" value={userData.confirmAccountInfo} onChange={handleChange} />
+                </RightAlignedDiv>
+              </div>
+            )}
+            {errorMessage && <ErrorMessage>{errorMessage}</ErrorMessage>}
           </StepWrapper>
         )}
         {step === 3 && (
@@ -84,6 +150,7 @@ const Signup = () => {
             <RightAlignedDiv>
               <Input type="date" name="birthDate" value={userData.birthDate} onChange={handleChange} width="100px" />
             </RightAlignedDiv>
+            {errorMessage && <ErrorMessage>{errorMessage}</ErrorMessage>}
           </StepWrapper>
         )}
         {step === 4 && (
@@ -91,18 +158,19 @@ const Signup = () => {
             <Label>어떤 서비스를 이용하고 싶으신가요?</Label>
             <ButtonGroup>
               <RoleWrapper>
-                <RoleButton role="아이" onClick={() => handleRoleChange("아이")}>
+                <RoleButton role="아이" onClick={() => handleRoleChange(2)}>
                   <img src={KidImage} alt="아이" />
                 </RoleButton>
                 아이
               </RoleWrapper>
               <RoleWrapper>
-                <RoleButton role="부모" onClick={() => handleRoleChange("부모")}>
+                <RoleButton role="부모" onClick={() => handleRoleChange(1)}>
                   <img src={ParentImage} alt="부모" />
                 </RoleButton>
                 부모
               </RoleWrapper>
             </ButtonGroup>
+            <ErrorWrapper>{errorMessage && <div tw="text-red-500 text-sm">{errorMessage}</div>}</ErrorWrapper>
           </StepWrapper>
         )}
         {step === 5 && (
@@ -180,7 +248,6 @@ const ButtonWrapper = styled.div`
 const ButtonGroup = tw.div`
   flex
   gap-9
-  
   justify-center
 `;
 
@@ -207,3 +274,19 @@ const CompleteWrapper = tw.div`
   items-center
   justify-center
 `;
+
+const ErrorWrapper = tw.div`
+  flex
+  flex-col
+  items-center
+  mt-5
+`;
+
+const ErrorMessage = tw.div`
+  self-end 
+  mb-10
+  text-red-500
+  text-sm
+  text-right
+  mt-2
+`;