diff --git a/src/main/java/com/cmc/suppin/member/controller/dto/MemberRequestDTO.java b/src/main/java/com/cmc/suppin/member/controller/dto/MemberRequestDTO.java
index 8b21f69..91b4604 100644
--- a/src/main/java/com/cmc/suppin/member/controller/dto/MemberRequestDTO.java
+++ b/src/main/java/com/cmc/suppin/member/controller/dto/MemberRequestDTO.java
@@ -22,7 +22,7 @@ public static class JoinDTO {
         private String name;
 
         @NotBlank(message = "비밀번호를 입력해주세요")
-        @Pattern(regexp = "(?=.*[0-9])(?=.*[a-zA-Z])(?=.*\\W)(?=\\S+$).{8,16}", message = "비밀번호는 8~16자 영문, 숫자, 특수문자를 사용하세요.")
+        @Pattern(regexp = "(?=.*[0-9])(?=.*[a-zA-Z])(?=.*\\W)(?=\\S+$).{8,20}", message = "비밀번호는 8~20자 영문, 숫자, 특수문자를 사용하세요.")
         private String password;
 
         @NotBlank(message = "이메일을 입력해주세요")
diff --git a/src/main/java/com/cmc/suppin/member/service/command/MemberCommandServiceImpl.java b/src/main/java/com/cmc/suppin/member/service/command/MemberCommandServiceImpl.java
index 64caa7c..e5223fb 100644
--- a/src/main/java/com/cmc/suppin/member/service/command/MemberCommandServiceImpl.java
+++ b/src/main/java/com/cmc/suppin/member/service/command/MemberCommandServiceImpl.java
@@ -33,6 +33,12 @@ public Member join(MemberRequestDTO.JoinDTO request) {
             throw new IllegalArgumentException("이미 존재하는 유저입니다.");
         }
 
+        // 비밀번호 조건 검증
+        String password = request.getPassword();
+        if (!isValidPassword(password)) {
+            throw new IllegalArgumentException("비밀번호는 8~20자 영문, 숫자, 특수문자를 사용해야 합니다.");
+        }
+
         // DTO를 Entity로 변환
         Member member = memberConverter.toEntity(request, bCryptPasswordEncoder);
 
@@ -42,6 +48,11 @@ public Member join(MemberRequestDTO.JoinDTO request) {
         return member;
     }
 
+    // 비밀번호 조건 검증 메서드
+    private boolean isValidPassword(String password) {
+        return password.matches("(?=.*[0-9])(?=.*[a-zA-Z])(?=.*\\W)(?=\\S+$).{8,20}");
+    }
+
     /**
      * ID 중복 확인
      */