diff --git a/src/test/java/com/gamzabat/algohub/feature/studygroup/controller/StudyGroupControllerTest.java b/src/test/java/com/gamzabat/algohub/feature/studygroup/controller/StudyGroupControllerTest.java
index 87e072ea..84fdea5e 100644
--- a/src/test/java/com/gamzabat/algohub/feature/studygroup/controller/StudyGroupControllerTest.java
+++ b/src/test/java/com/gamzabat/algohub/feature/studygroup/controller/StudyGroupControllerTest.java
@@ -301,7 +301,7 @@ void deleteGroupFailed_2() throws Exception {
 
 	@Test
 	@DisplayName("그룹 탈퇴 성공")
-	void leaveGroup() throws Exception {
+	void exitGroup() throws Exception {
 		// given
 		doNothing().when(studyGroupService).exitGroup(user, groupId);
 		// when, then
@@ -315,32 +315,32 @@ void leaveGroup() throws Exception {
 
 	@Test
 	@DisplayName("그룹 탈퇴 실패 : 존재하지 않는 그룹")
-	void leaveGroupFailed_1() throws Exception {
+	void exitGroupFailed_1() throws Exception {
 		// given
-		doThrow(new StudyGroupValidationException(HttpStatus.NOT_FOUND.value(), "존재하지 않는 그룹 입니다.")).when(
+		doThrow(new CannotFoundGroupException("존재하지 않는 그룹입니다.")).when(
 			studyGroupService).exitGroup(user, groupId);
 		// when, then
 		mockMvc.perform(delete("/api/groups/{groupId}/members/me", groupId)
 				.header("Authorization", token)
 				.contentType(MediaType.APPLICATION_JSON))
 			.andExpect(status().isNotFound())
-			.andExpect(jsonPath("$.error").value("존재하지 않는 그룹 입니다."));
+			.andExpect(jsonPath("$.error").value("존재하지 않는 그룹입니다."));
 
 		verify(studyGroupService, times(1)).exitGroup(any(User.class), anyLong());
 	}
 
 	@Test
 	@DisplayName("그룹 탈퇴 실패 : 이미 참여 안한 그룹")
-	void leaveGroupFailed_2() throws Exception {
+	void exitGroupFailed_2() throws Exception {
 		// given
-		doThrow(new GroupMemberValidationException(HttpStatus.BAD_REQUEST.value(), "이미 참여하지 않은 그룹 입니다.")).when(
+		doThrow(new GroupMemberValidationException(HttpStatus.BAD_REQUEST.value(), "참여하지 않은 그룹 입니다.")).when(
 			studyGroupService).exitGroup(user, groupId);
 		// when, then
 		mockMvc.perform(delete("/api/groups/{groupId}/members/me", groupId)
 				.header("Authorization", token)
 				.contentType(MediaType.APPLICATION_JSON))
 			.andExpect(status().isBadRequest())
-			.andExpect(jsonPath("$.error").value("이미 참여하지 않은 그룹 입니다."));
+			.andExpect(jsonPath("$.error").value("참여하지 않은 그룹 입니다."));
 
 		verify(studyGroupService, times(1)).exitGroup(any(User.class), anyLong());
 	}
@@ -359,7 +359,7 @@ void deleteUser() throws Exception {
 	}
 
 	@Test
-	@DisplayName("그룹 탈퇴 실패 : 참여하지 않은 그룹")
+	@DisplayName("멤버 삭제 실패 : 참여하지 않은 그룹")
 	void deleteMemberFailed_1() throws Exception {
 		// given
 		doThrow(new GroupMemberValidationException(HttpStatus.BAD_REQUEST.value(),
@@ -374,7 +374,7 @@ void deleteMemberFailed_1() throws Exception {
 	}
 
 	@Test
-	@DisplayName("그룹 탈퇴 실패 : 권한 없음")
+	@DisplayName("멤버 삭제 실패 : 권한 없음")
 	void deleteMemberFailed_2() throws Exception {
 		// given
 		doThrow(new UserValidationException("멤버를 삭제 할 권한이 없습니다.")).when(
diff --git a/src/test/java/com/gamzabat/algohub/service/StudyGroupServiceTest.java b/src/test/java/com/gamzabat/algohub/service/StudyGroupServiceTest.java
index f54d2dff..b92eb8b8 100644
--- a/src/test/java/com/gamzabat/algohub/service/StudyGroupServiceTest.java
+++ b/src/test/java/com/gamzabat/algohub/service/StudyGroupServiceTest.java
@@ -49,6 +49,7 @@
 import com.gamzabat.algohub.feature.group.studygroup.service.StudyGroupService;
 import com.gamzabat.algohub.feature.image.service.ImageService;
 import com.gamzabat.algohub.feature.notification.domain.NotificationSetting;
+import com.gamzabat.algohub.feature.notification.repository.NotificationRepository;
 import com.gamzabat.algohub.feature.notification.repository.NotificationSettingRepository;
 import com.gamzabat.algohub.feature.notification.service.NotificationService;
 import com.gamzabat.algohub.feature.problem.domain.Problem;
@@ -77,6 +78,8 @@ class StudyGroupServiceTest {
 	@Mock
 	private UserRepository userRepository;
 	@Mock
+	private NotificationRepository notificationRepository;
+	@Mock
 	private NotificationSettingRepository notificationSettingRepository;
 	@Mock
 	private RankingRepository rankingRepository;
@@ -263,6 +266,7 @@ void deleteGroup() {
 		verify(rankingRepository, times(1)).deleteAllByStudyGroup(group);
 		verify(notificationSettingRepository, times(1)).deleteAllByStudyGroup(group);
 		verify(groupMemberRepository, times(1)).deleteAllByStudyGroup(group);
+		verify(notificationRepository, times(1)).deleteAllByStudyGroup(group);
 		verify(studyGroupRepository, times(1)).delete(group);
 	}
 
@@ -290,6 +294,49 @@ void deleteGroupFailed_2() {
 			.hasFieldOrPropertyWithValue("error", "참여하지 않은 그룹입니다.");
 	}
 
+	@Test
+	@DisplayName("그룹 탈퇴 성공 (방장)")
+	void exitGroup() {
+		// given
+		when(studyGroupRepository.findById(10L)).thenReturn(Optional.of(group));
+		when(groupMemberRepository.findByUserAndStudyGroup(user, group)).thenReturn(Optional.ofNullable(groupMember1));
+		when(groupMemberRepository.findAllByStudyGroup(group)).thenReturn(
+			List.of(groupMember2, groupMember3));
+		when(studyGroupServiceObjectProvider.getObject()).thenReturn(studyGroupService);
+		// when
+		studyGroupService.exitGroup(user, 10L);
+		// then
+		verify(rankingRepository, times(1)).deleteByMember(groupMember1);
+		verify(notificationSettingRepository, times(1)).deleteByMember(groupMember1);
+		verify(groupMemberRepository, times(1)).delete(groupMember1);
+		verify(notificationRepository, times(1)).deleteAllByStudyGroup(group);
+		assertThat(groupMember3.getRole()).isEqualTo(RoleOfGroupMember.OWNER);
+	}
+
+	@Test
+	@DisplayName("그룹 탈퇴 실패 : 존재하지 않는 그룹")
+	void exitGroupFailed_1() {
+		// given
+		when(studyGroupRepository.findById(groupId)).thenReturn(Optional.empty());
+		// when, then
+		assertThatThrownBy(() -> studyGroupService.exitGroup(user, groupId))
+			.isInstanceOf(CannotFoundGroupException.class)
+			.hasFieldOrPropertyWithValue("errors", "존재하지 않는 그룹입니다.");
+	}
+
+	@Test
+	@DisplayName("그룹 탈퇴 실패 : 이미 참여하지 않은 그룹")
+	void exitGroupFailed_2() {
+		// given
+		when(studyGroupRepository.findById(10L)).thenReturn(Optional.ofNullable(group));
+		when(groupMemberRepository.findByUserAndStudyGroup(user2, group)).thenReturn(Optional.empty());
+		// when, then
+		assertThatThrownBy(() -> studyGroupService.exitGroup(user2, 10L))
+			.isInstanceOf(GroupMemberValidationException.class)
+			.hasFieldOrPropertyWithValue("code", HttpStatus.BAD_REQUEST.value())
+			.hasFieldOrPropertyWithValue("error", "참여하지 않은 그룹입니다.");
+	}
+
 	@Test
 	@DisplayName("그룹 목록 조회")
 	void getGroupList() {