diff --git a/backend/src/main/java/org/sejongisc/backend/betting/controller/BettingController.java b/backend/src/main/java/org/sejongisc/backend/betting/controller/BettingController.java
index 865841c1..cc18db6a 100644
--- a/backend/src/main/java/org/sejongisc/backend/betting/controller/BettingController.java
+++ b/backend/src/main/java/org/sejongisc/backend/betting/controller/BettingController.java
@@ -10,7 +10,6 @@
 import org.sejongisc.backend.betting.entity.UserBet;
 import org.sejongisc.backend.betting.service.BettingService;
 import org.sejongisc.backend.common.auth.springsecurity.CustomUserDetails;
-import org.sejongisc.backend.user.entity.User;
 import org.springframework.http.ResponseEntity;
 import org.springframework.security.core.annotation.AuthenticationPrincipal;
 import org.springframework.validation.annotation.Validated;
@@ -67,4 +66,11 @@ public ResponseEntity<Void> cancelUserBet(
         return ResponseEntity.noContent().build();
     }
 
+    @GetMapping("/user-bets/history")
+    public ResponseEntity<List<UserBet>> getAllUserBets(
+            @AuthenticationPrincipal CustomUserDetails principal){
+        List<UserBet> userBets = bettingService.getAllMyBets(principal.getUserId());
+
+        return ResponseEntity.ok(userBets);
+    }
 }
diff --git a/backend/src/main/java/org/sejongisc/backend/betting/entity/UserBet.java b/backend/src/main/java/org/sejongisc/backend/betting/entity/UserBet.java
index a0bd3ca8..693e84fc 100644
--- a/backend/src/main/java/org/sejongisc/backend/betting/entity/UserBet.java
+++ b/backend/src/main/java/org/sejongisc/backend/betting/entity/UserBet.java
@@ -10,6 +10,16 @@
 import java.util.UUID;
 
 @Entity
+@Table(
+    uniqueConstraints = @UniqueConstraint(
+        name = "uk_user_bet_round_user",
+        columnNames = {"round_id", "user_id"}
+    ),
+    indexes = {
+        @Index(name = "idx_user_bet_user", columnList = "user_id"),
+        @Index(name = "idx_user_bet_round", columnList = "round_id")
+    }
+)
 @Getter
 @Builder @NoArgsConstructor @AllArgsConstructor
 public class UserBet extends BasePostgresEntity {
diff --git a/backend/src/main/java/org/sejongisc/backend/betting/repository/UserBetRepository.java b/backend/src/main/java/org/sejongisc/backend/betting/repository/UserBetRepository.java
index 991e8e96..a1e81052 100644
--- a/backend/src/main/java/org/sejongisc/backend/betting/repository/UserBetRepository.java
+++ b/backend/src/main/java/org/sejongisc/backend/betting/repository/UserBetRepository.java
@@ -4,10 +4,14 @@
 import org.sejongisc.backend.betting.entity.UserBet;
 import org.springframework.data.jpa.repository.JpaRepository;
 
+import java.util.List;
 import java.util.Optional;
 import java.util.UUID;
 
 public interface UserBetRepository extends JpaRepository<UserBet, UUID> {
     boolean existsByRoundAndUserId(BetRound round, UUID userId);
     Optional<UserBet> findByUserBetIdAndUserId(UUID userBetId, UUID userId);
+
+
+    List<UserBet> findAllByUserIdOrderByRound_SettleAtDesc(UUID userId);
 }
diff --git a/backend/src/main/java/org/sejongisc/backend/betting/service/BettingService.java b/backend/src/main/java/org/sejongisc/backend/betting/service/BettingService.java
index 82a33565..638408e2 100644
--- a/backend/src/main/java/org/sejongisc/backend/betting/service/BettingService.java
+++ b/backend/src/main/java/org/sejongisc/backend/betting/service/BettingService.java
@@ -11,6 +11,7 @@
 import org.sejongisc.backend.point.entity.PointOrigin;
 import org.sejongisc.backend.point.entity.PointReason;
 import org.sejongisc.backend.point.service.PointHistoryService;
+import org.springframework.dao.DataIntegrityViolationException;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 
@@ -54,6 +55,11 @@ public boolean setAllowFree(){
         return random.nextDouble() < 0.2;
     }
 
+    public List<UserBet> getAllMyBets(UUID userId) {
+        // TODO : 필요 시 필터링, 정렬, 검색 로직 추가
+        return userBetRepository.findAllByUserIdOrderByRound_SettleAtDesc(userId);
+    }
+
     public void createBetRound(Scope scope) {
         Stock stock = getStock();
         LocalDateTime now = LocalDateTime.now();
@@ -88,7 +94,8 @@ public UserBet postUserBet(UUID userId, UserBetRequest userBetRequest) {
 
         LocalDateTime now = LocalDateTime.now();
 
-        if (now.isBefore(betRound.getOpenAt()) || now.isAfter(betRound.getLockAt())) {
+        // 허용 구간: [openAt, lockAt)
+        if (now.isBefore(betRound.getOpenAt()) || !now.isBefore(betRound.getLockAt())) {
             throw new CustomException(ErrorCode.BET_TIME_INVALID);
         }
 
@@ -114,7 +121,12 @@ public UserBet postUserBet(UUID userId, UserBetRequest userBetRequest) {
                 .betStatus(BetStatus.ACTIVE)
                 .build();
 
-        return userBetRepository.save(userBet);
+        try {
+            return userBetRepository.save(userBet);
+        } catch (DataIntegrityViolationException e) {
+            // DB 유니크 제약(중복 베팅) 위반 시
+            throw new CustomException(ErrorCode.BET_DUPLICATE);
+        }
     }
 
     @Transactional
@@ -124,7 +136,7 @@ public void cancelUserBet(UUID userId, UUID userBetId) {
 
         BetRound betRound = userBet.getRound();
 
-        if (LocalDateTime.now().isAfter(betRound.getLockAt())){
+        if (!LocalDateTime.now().isBefore(betRound.getLockAt())){
             throw new CustomException(ErrorCode.BET_ROUND_CLOSED);
         }
 
diff --git a/backend/src/test/java/org/sejongisc/backend/betting/service/BettingServiceTest.java b/backend/src/test/java/org/sejongisc/backend/betting/service/BettingServiceTest.java
index 76b84ba0..26d26a20 100644
--- a/backend/src/test/java/org/sejongisc/backend/betting/service/BettingServiceTest.java
+++ b/backend/src/test/java/org/sejongisc/backend/betting/service/BettingServiceTest.java
@@ -234,6 +234,51 @@ void findActiveRound_Weekly_Success() {
         verify(betRoundRepository, times(1)).findByStatusTrueAndScope(Scope.WEEKLY);
     }
 
+    @Test
+    @DisplayName("getAllMyBets() - 유저 ID로 조회 시 Repository 호출 및 결과 반환 확인")
+    void getAllMyBets_Success() {
+        // given
+        UUID userId = UUID.randomUUID();
+        BetRound round = BetRound.builder()
+                .title("테스트 라운드")
+                .openAt(LocalDateTime.now().minusHours(2))
+                .lockAt(LocalDateTime.now().plusHours(1))
+                .settleAt(LocalDateTime.now().plusHours(2))
+                .build();
+
+        UserBet bet1 = UserBet.builder()
+                .userBetId(UUID.randomUUID())
+                .round(round)
+                .userId(userId)
+                .option(BetOption.RISE)
+                .stakePoints(100)
+                .isFree(false)
+                .build();
+
+        UserBet bet2 = UserBet.builder()
+                .userBetId(UUID.randomUUID())
+                .round(round)
+                .userId(userId)
+                .option(BetOption.FALL)
+                .stakePoints(50)
+                .isFree(true)
+                .build();
+
+        List<UserBet> mockResult = List.of(bet1, bet2);
+        when(userBetRepository.findAllByUserIdOrderByRound_SettleAtDesc(userId))
+                .thenReturn(mockResult);
+
+        // when
+        List<UserBet> result = bettingService.getAllMyBets(userId);
+
+        // then
+        verify(userBetRepository, times(1))
+                .findAllByUserIdOrderByRound_SettleAtDesc(userId);
+        assertThat(result).hasSize(2);
+        assertThat(result.get(0).getUserId()).isEqualTo(userId);
+        assertThat(result.get(1).getRound().getTitle()).isEqualTo("테스트 라운드");
+    }
+
     private BetRound openRoundNow() {
         LocalDateTime now = LocalDateTime.now();
         return BetRound.builder()