diff --git a/backend/src/main/java/com/ai/lawyer/global/util/AuthUtil.java b/backend/src/main/java/com/ai/lawyer/global/util/AuthUtil.java
index aa8a7a6..6495bf3 100644
--- a/backend/src/main/java/com/ai/lawyer/global/util/AuthUtil.java
+++ b/backend/src/main/java/com/ai/lawyer/global/util/AuthUtil.java
@@ -1,43 +1,56 @@
 package com.ai.lawyer.global.util;
 
 import org.springframework.security.core.Authentication;
+import org.springframework.security.core.GrantedAuthority;
 import org.springframework.security.core.context.SecurityContextHolder;
-import org.springframework.security.core.userdetails.User;
 import org.springframework.web.server.ResponseStatusException;
 import org.springframework.http.HttpStatus;
 import org.springframework.stereotype.Component;
 import org.springframework.beans.factory.annotation.Autowired;
 import com.ai.lawyer.domain.member.repositories.MemberRepository;
+import com.ai.lawyer.domain.member.repositories.OAuth2MemberRepository;
 import com.ai.lawyer.domain.member.entity.Member;
 
 @Component
 public class AuthUtil {
     private static MemberRepository memberRepository;
+    private static OAuth2MemberRepository oauth2MemberRepository;
 
     @Autowired
     public AuthUtil(MemberRepository memberRepository) {
         AuthUtil.memberRepository = memberRepository;
     }
 
+    @Autowired(required = false)
+    public void setOauth2MemberRepository(OAuth2MemberRepository oauth2MemberRepository) {
+        AuthUtil.oauth2MemberRepository = oauth2MemberRepository;
+    }
+
     public static Long getCurrentMemberId() {
         Authentication authentication = SecurityContextHolder.getContext().getAuthentication();
         if (authentication != null && authentication.isAuthenticated()) {
             Object principal = authentication.getPrincipal();
             System.out.println("[AuthUtil] principal class: " + principal.getClass().getName() + ", value: " + principal);
-            if (principal instanceof org.springframework.security.core.userdetails.User user) {
-                try {
-                    return Long.parseLong(user.getUsername());
-                } catch (NumberFormatException e) {
-                    return null;
+            switch (principal) {
+                case org.springframework.security.core.userdetails.User user -> {
+                    try {
+                        return Long.parseLong(user.getUsername());
+                    } catch (NumberFormatException e) {
+                        return null;
+                    }
+                }
+                case String str -> {
+                    try {
+                        return Long.parseLong(str);
+                    } catch (NumberFormatException e) {
+                        return null;
+                    }
                 }
-            } else if (principal instanceof String str) {
-                try {
-                    return Long.parseLong(str);
-                } catch (NumberFormatException e) {
-                    return null;
+                case Long l -> {
+                    return l;
+                }
+                default -> {
                 }
-            } else if (principal instanceof Long l) {
-                return l;
             }
         }
         return null;
@@ -50,13 +63,45 @@ public static String getCurrentMemberRole() {
         }
         return authentication.getAuthorities().stream()
             .findFirst()
-            .map(auth -> auth.getAuthority())
+            .map(GrantedAuthority::getAuthority)
             .orElse(null);
     }
 
+    /**
+     * memberId로 회원을 조회합니다. (Member 또는 OAuth2Member)
+     * OAuth2Member인 경우 Member 객체로 변환하여 반환합니다.
+     * @param memberId 회원 ID
+     * @return Member 객체
+     * @throws ResponseStatusException 회원을 찾을 수 없는 경우
+     */
     public static Member getMemberOrThrow(Long memberId) {
-        return memberRepository.findById(memberId)
-            .orElseThrow(() -> new ResponseStatusException(HttpStatus.NOT_FOUND, "회원 정보를 찾을 수 없습니다"));
+        // 먼저 Member 테이블에서 조회
+        java.util.Optional<Member> member = memberRepository.findById(memberId);
+        if (member.isPresent()) {
+            return member.get();
+        }
+
+        // Member 테이블에 없으면 OAuth2Member 테이블에서 조회
+        if (oauth2MemberRepository != null) {
+            java.util.Optional<com.ai.lawyer.domain.member.entity.OAuth2Member> oauth2Member =
+                oauth2MemberRepository.findById(memberId);
+            if (oauth2Member.isPresent()) {
+                // OAuth2Member를 Member로 변환 (엔티티 호환성을 위해)
+                com.ai.lawyer.domain.member.entity.OAuth2Member oauth = oauth2Member.get();
+                return Member.builder()
+                        .memberId(oauth.getMemberId())
+                        .loginId(oauth.getLoginId())
+                        .name(oauth.getName())
+                        .age(oauth.getAge())
+                        .gender(oauth.getGender())
+                        .role(oauth.getRole())
+                        .password("") // OAuth2는 비밀번호 없음
+                        .build();
+            }
+        }
+
+        // 둘 다 없으면 예외 발생
+        throw new ResponseStatusException(HttpStatus.NOT_FOUND, "회원 정보를 찾을 수 없습니다");
     }
 
     public static Long getAuthenticatedMemberId() {