diff --git a/firstSeminarAdvancedAssignment/docs/readme.md b/firstSeminarAdvancedAssignment/docs/readme.md
index 6c766c0..1082707 100644
--- a/firstSeminarAdvancedAssignment/docs/readme.md
+++ b/firstSeminarAdvancedAssignment/docs/readme.md
@@ -11,8 +11,8 @@
     * [ ] ⚠️ 생년월일이 'Integer(4)-Integer(2)-Integer(2)' 형식이 아니라면, 예외발생
     * [ ] ⚠️ 전화번호가 'Integer(3)-Integer(4)-Integer(4)' 형식이 아니라면, 예외발생
   + [X] 비밀번호 등록
-    * [ ] ⚠️ 비밀번호가 6자가 아니라면, 예외발생
-    * [ ] ⚠️ 비밀번호가 숫자가 아니라면, 예외발생
+    * [X] ⚠️ 비밀번호가 6자가 아니라면, 예외발생
+    * [X] ⚠️ 비밀번호가 정수형이 아니라면, 예외발생
 - [X] 잔액 조회 기능
   + [X] 계좌번호와 비밀번호 입력 시, 잔액 조회
   + [X] ⚠️ 존재하지 않는 계좌번호 입력 시, 예외발생
diff --git a/firstSeminarAdvancedAssignment/src/main/java/sopt/org/firstSeminarAdvancedAssignment/domain/Client.java b/firstSeminarAdvancedAssignment/src/main/java/sopt/org/firstSeminarAdvancedAssignment/domain/Client.java
index 4d2da70..a5e75d8 100644
--- a/firstSeminarAdvancedAssignment/src/main/java/sopt/org/firstSeminarAdvancedAssignment/domain/Client.java
+++ b/firstSeminarAdvancedAssignment/src/main/java/sopt/org/firstSeminarAdvancedAssignment/domain/Client.java
@@ -14,8 +14,9 @@ public class Client {
 
 
     public Client(String accountNumber, String name, String birth, String tel, String address, String password) {
-        validateAccountNumber(accountNumber);
+        validateAccountNumberForRegister(accountNumber);
         this.accountNumber = accountNumber;
+        validatePasswordForRegister(password);
         this.password = password;
         this.name = name;
         this.birth = birth;
@@ -24,6 +25,7 @@ public Client(String accountNumber, String name, String birth, String tel, Strin
         this.amount = 0;
     }
 
+
     public boolean checkPassword(String password) {
         if (this.password.equals(password)) {
             return true;
@@ -39,7 +41,9 @@ public int getAmount() {
         return amount;
     }
 
-    private void validateAccountNumber(String accountNumber) {
+
+
+    private void validateAccountNumberForRegister(String accountNumber) {
         String[] seperatedAccountNumber = accountNumber.split("-");
 
         validateAccountNumberLength(seperatedAccountNumber);
@@ -62,6 +66,26 @@ private void validateAccountNumberLength(String[] seperatedAccountNumber) {
         }
     }
 
+    private void validatePasswordForRegister(String password) {
+        validatePasswordNumberFormat(password);
+        validatePasswordNumberLength(password);
+    }
+
+    private void validatePasswordNumberLength(String password) {
+        if(password.length() != 6) {
+            throw new IllegalArgumentException(createErrorMessage("비밀번호는 6자로 구성되어야합니다."));
+        }
+    }
+
+    private void validatePasswordNumberFormat(String password) {
+        try {
+            Integer.parseInt(password);
+        }catch (NumberFormatException e) {
+            throw new IllegalArgumentException(createErrorMessage("비밀번호는 정수형으로 구성되어야합니다."));
+        }
+    }
+
+
     public int transfer(int transferAmount) {
         validateAccountBalanceToTransfer(transferAmount);
         this.amount -= transferAmount;