diff --git a/src/main/java/com/diareat/diareat/auth/service/CustomUserDetailService.java b/src/main/java/com/diareat/diareat/auth/service/CustomUserDetailService.java
new file mode 100644
index 0000000..622e09f
--- /dev/null
+++ b/src/main/java/com/diareat/diareat/auth/service/CustomUserDetailService.java
@@ -0,0 +1,22 @@
+package com.diareat.diareat.auth.service;
+
+import com.diareat.diareat.user.repository.UserRepository;
+import com.diareat.diareat.util.api.ResponseCode;
+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;
+
+@RequiredArgsConstructor
+@Service
+public class CustomUserDetailService implements UserDetailsService {
+
+    private final UserRepository userRepository;
+
+    @Override
+    public UserDetails loadUserByUsername(String keyCode) throws UsernameNotFoundException {
+        return userRepository.findByKeyCode(keyCode)
+                .orElseThrow(() -> new UsernameNotFoundException(ResponseCode.USER_NOT_FOUND.getMessage()));
+    }
+}
diff --git a/src/main/java/com/diareat/diareat/user/domain/User.java b/src/main/java/com/diareat/diareat/user/domain/User.java
index 6852f48..98e16d7 100644
--- a/src/main/java/com/diareat/diareat/user/domain/User.java
+++ b/src/main/java/com/diareat/diareat/user/domain/User.java
@@ -3,18 +3,21 @@
 import com.diareat.diareat.food.domain.FavoriteFood;
 import com.diareat.diareat.food.domain.Food;
 import com.fasterxml.jackson.annotation.JsonIgnore;
-import lombok.AccessLevel;
-import lombok.Getter;
-import lombok.NoArgsConstructor;
+import lombok.*;
+import org.springframework.security.core.GrantedAuthority;
+import org.springframework.security.core.userdetails.UserDetails;
+import org.springframework.security.core.authority.SimpleGrantedAuthority;
 
 import javax.persistence.*;
 import java.util.ArrayList;
+import java.util.Collection;
 import java.util.List;
+import java.util.stream.Collectors;
 
 @Getter
 @NoArgsConstructor(access = AccessLevel.PROTECTED)
 @Entity
-public class User {
+public class User implements UserDetails {
 
     @Id @GeneratedValue(strategy = GenerationType.IDENTITY)
     @Column(name = "user_id")
@@ -23,6 +26,7 @@ public class User {
     private String name; // 닉네임
 
     @JsonIgnore
+    @Column(length = 100, nullable = false, unique = true)
     private String keyCode; // 로그인 식별키
 
     private String image; // 프로필 사진 경로
@@ -43,6 +47,50 @@ public class User {
     @OneToMany(mappedBy = "user", cascade = {CascadeType.PERSIST, CascadeType.REMOVE}) // 유저가 탈퇴하면 즐겨찾기 음식도 삭제
     private List<FavoriteFood> favoriteFoods = new ArrayList<>();
 
+    // Jwt 전용 설정 (UserDetails 인터페이스 구현)
+
+    @ElementCollection(fetch = FetchType.EAGER) //roles 컬렉션
+    private List<String> roles = new ArrayList<>();
+
+    @Override   //사용자의 권한 목록 리턴
+    public Collection<? extends GrantedAuthority> getAuthorities() {
+        return this.roles.stream()
+                .map(SimpleGrantedAuthority::new)
+                .collect(Collectors.toList());
+    }
+
+    @Override
+    public String getUsername() {
+        return keyCode;
+    }
+
+    @Override
+    public String getPassword() {
+        return null;
+    }
+
+    @Override
+    public boolean isAccountNonExpired() {
+        return true;
+    }
+
+    @Override
+    public boolean isAccountNonLocked() {
+        return true;
+    }
+
+    @Override
+    public boolean isCredentialsNonExpired() {
+        return true;
+    }
+
+    @Override
+    public boolean isEnabled() {
+        return true;
+    }
+
+    // Jwt 전용 설정 종료
+
     // 생성 메서드
     public static User createUser(String name, String image, String keyCode, int height, int weight, int gender, int age, BaseNutrition baseNutrition) {
         User user = new User();