diff --git a/src/main/java/com/Timo/Timo/domain/user/docs/OnboardingControllerDocs.java b/src/main/java/com/Timo/Timo/domain/user/docs/OnboardingControllerDocs.java
index 13b7de82..185268f9 100644
--- a/src/main/java/com/Timo/Timo/domain/user/docs/OnboardingControllerDocs.java
+++ b/src/main/java/com/Timo/Timo/domain/user/docs/OnboardingControllerDocs.java
@@ -16,7 +16,10 @@ public interface OnboardingControllerDocs {
 
   @Operation(
       summary = "온보딩 완료",
-      description = "언어, 예측 정확도, 기상/취침 시간을 저장하고 온보딩을 완료 처리합니다.")
+      description = """
+          언어, 예측 정확도, 기상/취침 시간을 저장하고 온보딩을 완료 처리합니다.
+          온보딩 완료 시 이용약관에 동의한 것으로 함께 처리됩니다.
+          """)
   @ApiResponses({
       @ApiResponse(
           responseCode = "200",
diff --git a/src/main/java/com/Timo/Timo/domain/user/dto/request/OnboardingRequest.java b/src/main/java/com/Timo/Timo/domain/user/dto/request/OnboardingRequest.java
index 7b11a4dc..21479fbe 100644
--- a/src/main/java/com/Timo/Timo/domain/user/dto/request/OnboardingRequest.java
+++ b/src/main/java/com/Timo/Timo/domain/user/dto/request/OnboardingRequest.java
@@ -23,5 +23,4 @@ public record OnboardingRequest(
     @NotNull(message = "bedTime은 필수입니다.")
     @Pattern(regexp = "^([01]\\d|2[0-3]):[0-5]\\d$", message = "bedTime 형식은 HH:MM 이어야 합니다.")
     String bedTime
-){
-}
+){}
diff --git a/src/main/java/com/Timo/Timo/domain/user/entity/User.java b/src/main/java/com/Timo/Timo/domain/user/entity/User.java
index f46dbc14..dfb8d96b 100644
--- a/src/main/java/com/Timo/Timo/domain/user/entity/User.java
+++ b/src/main/java/com/Timo/Timo/domain/user/entity/User.java
@@ -74,6 +74,9 @@ public class User extends BaseTimeEntity {
   @Column(name = "calendar_email")
   private String calendarEmail;
 
+  @Column(name = "terms_agreed", nullable = false)
+  private boolean termsAgreed;
+
   public void update(String name, String profileImageUrl) {
     this.name = name;
     this.profileImageUrl = profileImageUrl;
@@ -89,6 +92,7 @@ public void completeOnboarding(
     this.predictionAccuracy = predictionAccuracy;
     this.wakeUpTime = wakeUpTime;
     this.bedTime = bedTime;
+    this.termsAgreed = true;
     this.onboardingCompleted = true;
   }
 
@@ -123,5 +127,6 @@ private User(
 
     this.calendarConnected = false;
     this.calendarEmail = null;
+    this.termsAgreed = false;
   }
 }
diff --git a/src/main/java/com/Timo/Timo/domain/user/exception/UserErrorCode.java b/src/main/java/com/Timo/Timo/domain/user/exception/UserErrorCode.java
index 3a73c0e6..6162d4d1 100644
--- a/src/main/java/com/Timo/Timo/domain/user/exception/UserErrorCode.java
+++ b/src/main/java/com/Timo/Timo/domain/user/exception/UserErrorCode.java
@@ -9,9 +9,10 @@
 @RequiredArgsConstructor
 public enum UserErrorCode implements BaseErrorCode {
 
-  USER_400_INVALID_TIME(HttpStatus.BAD_REQUEST, "USER_400", "취침 시간은 기상 시간보다 이후여야 합니다."),
+  USER_INVALID_TIME(HttpStatus.BAD_REQUEST, "USER_400", "취침 시간은 기상 시간보다 이후여야 합니다."),
   INVALID_TIMEZONE(HttpStatus.BAD_REQUEST, "USER_400", "유효하지 않은 시간대 ID입니다."),
-  USER_NOT_FOUND(HttpStatus.NOT_FOUND, "USER_404", "존재하지 않는 사용자입니다.");
+  USER_NOT_FOUND(HttpStatus.NOT_FOUND, "USER_404", "존재하지 않는 사용자입니다."),
+  ;
 
   private final HttpStatus httpStatus;
   private final String code;
diff --git a/src/main/java/com/Timo/Timo/domain/user/service/OnboardingService.java b/src/main/java/com/Timo/Timo/domain/user/service/OnboardingService.java
index 2ed7f29a..d24b277e 100644
--- a/src/main/java/com/Timo/Timo/domain/user/service/OnboardingService.java
+++ b/src/main/java/com/Timo/Timo/domain/user/service/OnboardingService.java
@@ -27,7 +27,7 @@ public OnboardingResponse completeOnboarding(Long userId, OnboardingRequest requ
     LocalTime bedTime = LocalTime.parse(request.bedTime());
 
     if (!bedTime.isAfter(wakeUpTime)) {
-      throw new CustomException(UserErrorCode.USER_400_INVALID_TIME);
+      throw new CustomException(UserErrorCode.USER_INVALID_TIME);
     }
 
     user.completeOnboarding(