diff --git a/src/main/java/com/xit/core/oauth2/oauth/service/CustomUserDetailsService.java b/src/main/java/com/xit/core/oauth2/oauth/service/CustomUserDetailsService.java
new file mode 100644
index 0000000..122187c
--- /dev/null
+++ b/src/main/java/com/xit/core/oauth2/oauth/service/CustomUserDetailsService.java
@@ -0,0 +1,37 @@
+package com.xit.core.oauth2.oauth.service;
+
+import com.xit.biz.ctgy.auth.UserMinPrincipal;
+import com.xit.biz.ctgy.dto.MinUserinfoDto;
+import com.xit.biz.ctgy.entity.MinUserinfo;
+import com.xit.biz.ctgy.v2.repository.UserDao;
+import com.xit.core.constant.ErrorCode;
+import com.xit.core.exception.CustomBaseException;
+import lombok.RequiredArgsConstructor;
+import org.springframework.security.core.userdetails.UserDetails;
+import org.springframework.security.core.userdetails.UserDetailsService;
+import org.springframework.security.core.userdetails.UsernameNotFoundException;
+import org.springframework.stereotype.Service;
+
+@Service
+@RequiredArgsConstructor
+public class CustomUserDetailsService implements UserDetailsService {
+
+    private final UserDao userDao;
+
+    @Override
+    public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
+        MinUserinfoDto user = userDao.findByUserid(username).orElseThrow(() -> new CustomBaseException(ErrorCode.USER_NOT_FOUND));
+        return UserMinPrincipal.create(MinUserinfo.builder()
+                .userid(user.getUserid())
+                .passwd(user.getPasswd())
+                .name(user.getName())
+                .regnum(user.getRegnum())
+                .mphone(user.getMphone())
+                .email(user.getEmail())
+                .accesstype(user.getAccesstype())
+                .regdate(user.getRegdate())
+                .isenable(user.getIsenable())
+                .gu(user.getGu())
+                .build());
+    }
+}