diff --git a/src/main/java/com/sb/web/auth/dto/LoginRequest.java b/src/main/java/com/sb/web/auth/dto/LoginRequest.java
index 0c11965..a9283c4 100644
--- a/src/main/java/com/sb/web/auth/dto/LoginRequest.java
+++ b/src/main/java/com/sb/web/auth/dto/LoginRequest.java
@@ -14,4 +14,7 @@ public class LoginRequest {
 
     @NotBlank(message = "비밀번호를 입력하세요.")
     private String password;
+
+    /** 로그인 상태 유지(자동 로그인). true 면 세션을 길게(30일) 유지 */
+    private boolean rememberMe;
 }
diff --git a/src/main/java/com/sb/web/auth/dto/SessionUser.java b/src/main/java/com/sb/web/auth/dto/SessionUser.java
index 7cf03b3..f96255d 100644
--- a/src/main/java/com/sb/web/auth/dto/SessionUser.java
+++ b/src/main/java/com/sb/web/auth/dto/SessionUser.java
@@ -23,6 +23,7 @@ public class SessionUser implements Serializable {
     private String name;
     private String role;
     private String provider;
+    private boolean rememberMe; // 자동 로그인 세션 여부 (슬라이딩 만료 TTL 결정용)
 
     public static SessionUser from(Member m) {
         return SessionUser.builder()
diff --git a/src/main/java/com/sb/web/auth/service/AuthService.java b/src/main/java/com/sb/web/auth/service/AuthService.java
index 33d528a..347a222 100644
--- a/src/main/java/com/sb/web/auth/service/AuthService.java
+++ b/src/main/java/com/sb/web/auth/service/AuthService.java
@@ -36,7 +36,8 @@ public class AuthService {
     private final RedisTemplate<String, Object> redisTemplate;
 
     private static final String SESSION_PREFIX = "session:";
-    private static final Duration SESSION_TTL = Duration.ofMinutes(60);
+    private static final Duration SESSION_TTL = Duration.ofMinutes(60);        // 일반 세션
+    private static final Duration REMEMBER_TTL = Duration.ofDays(30);          // 자동 로그인(로그인 상태 유지)
 
     @Transactional
     public MemberResponse signup(SignupRequest req) {
@@ -68,13 +69,17 @@ public class AuthService {
             throw new ApiException(HttpStatus.FORBIDDEN, "사용할 수 없는 계정입니다.");
         }
 
+        Duration ttl = req.isRememberMe() ? REMEMBER_TTL : SESSION_TTL;
+        SessionUser session = SessionUser.from(member);
+        session.setRememberMe(req.isRememberMe());
+
         String token = UUID.randomUUID().toString().replace("-", "");
-        redisTemplate.opsForValue().set(SESSION_PREFIX + token, SessionUser.from(member), SESSION_TTL);
-        log.info("[login] {} (token issued)", member.getLoginId());
+        redisTemplate.opsForValue().set(SESSION_PREFIX + token, session, ttl);
+        log.info("[login] {} (token issued, rememberMe={})", member.getLoginId(), req.isRememberMe());
 
         return LoginResponse.builder()
                 .token(token)
-                .expiresInSeconds(SESSION_TTL.getSeconds())
+                .expiresInSeconds(ttl.getSeconds())
                 .member(MemberResponse.from(member))
                 .build();
     }
@@ -89,7 +94,8 @@ public class AuthService {
         String key = SESSION_PREFIX + token;
         Object cached = redisTemplate.opsForValue().get(key);
         if (cached instanceof SessionUser user) {
-            redisTemplate.expire(key, SESSION_TTL);
+            // 슬라이딩 만료: 자동 로그인 세션이면 길게(30일), 아니면 60분으로 갱신
+            redisTemplate.expire(key, user.isRememberMe() ? REMEMBER_TTL : SESSION_TTL);
             return user;
         }
         return null;