diff --git a/src/main/java/com/back/catchmate/domain/chat/controller/ChatController.java b/src/main/java/com/back/catchmate/domain/chat/controller/ChatController.java
index 2e68c5d..e7d2e21 100644
--- a/src/main/java/com/back/catchmate/domain/chat/controller/ChatController.java
+++ b/src/main/java/com/back/catchmate/domain/chat/controller/ChatController.java
@@ -29,7 +29,7 @@ public class ChatController {
     @MessageMapping("/chat.{chatRoomId}")
     @SendTo("/topic/chat.{chatRoomId}")
     public void sendMessage(@DestinationVariable Long chatRoomId, ChatMessageRequest request) {
-        chatService.sendMessage(chatRoomId, request);
+        chatService.sendChatMessage(chatRoomId, request);
     }
 
     @GetMapping("/{chatRoomId}")
diff --git a/src/main/java/com/back/catchmate/domain/chat/converter/ChatMessageConverter.java b/src/main/java/com/back/catchmate/domain/chat/converter/ChatMessageConverter.java
index de44553..f53f13e 100644
--- a/src/main/java/com/back/catchmate/domain/chat/converter/ChatMessageConverter.java
+++ b/src/main/java/com/back/catchmate/domain/chat/converter/ChatMessageConverter.java
@@ -33,7 +33,7 @@ public ChatResponse.PagedChatMessageInfo toPagedChatMessageInfo(Page<ChatMessage
     private ChatMessageInfo toChatMessageInfo(ChatMessage chatMessage) {
         return ChatMessageInfo.builder()
                 .id(chatMessage.getId())
-                .roomId(chatMessage.getRoomId())
+                .roomId(chatMessage.getChatRoomId())
                 .content(chatMessage.getContent())
                 .senderId(chatMessage.getSenderId())
                 .build();
@@ -41,7 +41,7 @@ private ChatMessageInfo toChatMessageInfo(ChatMessage chatMessage) {
 
     public ChatMessage toChatMessage(Long chatRoomId, String content, Long senderId, MessageType messageType) {
         return ChatMessage.builder()
-                .roomId(chatRoomId)
+                .chatRoomId(chatRoomId)
                 .content(content)
                 .senderId(senderId)
                 .sendTime(LocalDateTime.now(ZoneId.of("Asia/Seoul")))
@@ -49,9 +49,19 @@ public ChatMessage toChatMessage(Long chatRoomId, String content, Long senderId,
                 .build();
     }
 
+    public ChatMessage toEnterLeaveMessage(Long chatRoomId, String content, Long userId, MessageType messageType) {
+        return ChatMessage.builder()
+                .chatRoomId(chatRoomId)
+                .content(content)
+                .senderId(userId)
+                .sendTime(LocalDateTime.now(ZoneId.of("Asia/Seoul")))  // 서울 시간으로 시간 설정
+                .messageType(messageType.name())  // 메시지 타입 설정 (ENTER 또는 LEAVE)
+                .build();
+    }
+
     public ChatMessage toDateMessage(Long chatRoomId, LocalDateTime localDateTime) {
         return ChatMessage.builder()
-                .roomId(chatRoomId)
+                .chatRoomId(chatRoomId)
                 .content(formatDate(localDateTime))
                 .senderId(-1L)
                 .messageType(MessageType.DATE.name())
diff --git a/src/main/java/com/back/catchmate/domain/chat/entity/ChatMessage.java b/src/main/java/com/back/catchmate/domain/chat/entity/ChatMessage.java
index 20e9641..d16f588 100644
--- a/src/main/java/com/back/catchmate/domain/chat/entity/ChatMessage.java
+++ b/src/main/java/com/back/catchmate/domain/chat/entity/ChatMessage.java
@@ -18,7 +18,7 @@
 public class ChatMessage {
     @Id
     private ObjectId id;
-    private Long roomId;
+    private Long chatRoomId;
     private String content;
     private Long senderId;
     private LocalDateTime sendTime;
diff --git a/src/main/java/com/back/catchmate/domain/chat/repository/ChatMessageRepository.java b/src/main/java/com/back/catchmate/domain/chat/repository/ChatMessageRepository.java
index a67148c..171b12d 100644
--- a/src/main/java/com/back/catchmate/domain/chat/repository/ChatMessageRepository.java
+++ b/src/main/java/com/back/catchmate/domain/chat/repository/ChatMessageRepository.java
@@ -6,7 +6,7 @@
 import org.springframework.data.mongodb.repository.MongoRepository;
 
 public interface ChatMessageRepository extends MongoRepository<ChatMessage, String> {
-    Page<ChatMessage> findByRoomIdOrderByIdDesc(Long roomId, Pageable pageable);
+    Page<ChatMessage> findByChatRoomIdOrderByIdDesc(Long roomId, Pageable pageable);
 
-    ChatMessage findFirstByRoomIdOrderBySendTimeDesc(Long roomId);
+    ChatMessage findFirstByChatRoomIdOrderBySendTimeDesc(Long roomId);
 }
diff --git a/src/main/java/com/back/catchmate/domain/chat/service/ChatRoomServiceImpl.java b/src/main/java/com/back/catchmate/domain/chat/service/ChatRoomServiceImpl.java
index 845b03a..d8ee06a 100644
--- a/src/main/java/com/back/catchmate/domain/chat/service/ChatRoomServiceImpl.java
+++ b/src/main/java/com/back/catchmate/domain/chat/service/ChatRoomServiceImpl.java
@@ -17,9 +17,12 @@
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 
+import static com.back.catchmate.domain.chat.dto.ChatRequest.ChatMessageRequest.MessageType;
+
 @Service
 @RequiredArgsConstructor
 public class ChatRoomServiceImpl implements ChatRoomService {
+    private final ChatService chatService;
     private final UserRepository userRepository;
     private final ChatRoomRepository chatRoomRepository;
     private final UserChatRoomRepository userChatRoomRepository;
@@ -54,6 +57,10 @@ public StateResponse leaveChatRoom(Long userId, Long chatRoomId) {
         // 채팅방에서 참여자 수 감소
         chatRoom.decrementParticipantCount();
 
+        // 퇴장 메시지 보내기
+        String content = user.getNickName() + " 님이 채팅을 떠났어요";  // 퇴장 메시지 내용
+        chatService.sendEnterLeaveMessage(chatRoom.getId(), content, user.getId(), MessageType.LEAVE);
+
         return new StateResponse(true);
     }
 }
diff --git a/src/main/java/com/back/catchmate/domain/chat/service/ChatService.java b/src/main/java/com/back/catchmate/domain/chat/service/ChatService.java
index 0679920..a54cfc4 100644
--- a/src/main/java/com/back/catchmate/domain/chat/service/ChatService.java
+++ b/src/main/java/com/back/catchmate/domain/chat/service/ChatService.java
@@ -5,7 +5,9 @@
 import org.springframework.data.domain.Pageable;
 
 public interface ChatService {
-    void sendMessage(Long chatRoomId, ChatMessageRequest request);
+    void sendChatMessage(Long chatRoomId, ChatMessageRequest request);
+
+    void sendEnterLeaveMessage(Long chatRoomId, String content, Long senderId, ChatMessageRequest.MessageType messageType);
 
     ChatResponse.PagedChatMessageInfo getChatMessageList(Long userId, Long roomId, Pageable pageable);
 }
diff --git a/src/main/java/com/back/catchmate/domain/chat/service/ChatServiceImpl.java b/src/main/java/com/back/catchmate/domain/chat/service/ChatServiceImpl.java
index c4a4440..6da6d91 100644
--- a/src/main/java/com/back/catchmate/domain/chat/service/ChatServiceImpl.java
+++ b/src/main/java/com/back/catchmate/domain/chat/service/ChatServiceImpl.java
@@ -36,7 +36,7 @@ public class ChatServiceImpl implements ChatService {
     // 메시지를 특정 채팅방으로 전송
     @Override
     @Transactional
-    public void sendMessage(Long chatRoomId, ChatMessageRequest request) {
+    public void sendChatMessage(Long chatRoomId, ChatMessageRequest request) {
         String destination = "/topic/chat." + chatRoomId;
 
         if (request.getMessageType() == MessageType.TALK) {
@@ -62,7 +62,7 @@ public void sendMessage(Long chatRoomId, ChatMessageRequest request) {
 
     private boolean isNewDateMessageNeeded(Long chatRoomId, LocalDateTime newMessageTime) {
         LocalDate newDate = newMessageTime.toLocalDate();
-        ChatMessage chatMessage = chatMessageRepository.findFirstByRoomIdOrderBySendTimeDesc(chatRoomId);
+        ChatMessage chatMessage = chatMessageRepository.findFirstByChatRoomIdOrderBySendTimeDesc(chatRoomId);
 
         if (chatMessage == null) {
             return true;
@@ -72,6 +72,17 @@ private boolean isNewDateMessageNeeded(Long chatRoomId, LocalDateTime newMessage
         }
     }
 
+    @Override
+    @Transactional
+    public void sendEnterLeaveMessage(Long chatRoomId, String content, Long senderId, MessageType messageType) {
+        // 메시지를 DB에 저장
+        ChatMessage chatMessage = chatMessageConverter.toEnterLeaveMessage(chatRoomId, content, senderId, messageType);
+        chatMessageRepository.save(chatMessage);
+
+        // WebSocket을 통해 실시간 메시지 전송
+        messagingTemplate.convertAndSend("/topic/chat." + chatRoomId, chatMessage);
+    }
+
     @Override
     @Transactional(readOnly = true)
     public PagedChatMessageInfo getChatMessageList(Long userId, Long chatRoomId, Pageable pageable) {
@@ -79,7 +90,7 @@ public PagedChatMessageInfo getChatMessageList(Long userId, Long chatRoomId, Pag
             throw new BaseException(ErrorCode.USER_CHATROOM_NOT_FOUND);
         }
 
-        Page<ChatMessage> chatMessageList = chatMessageRepository.findByRoomIdOrderByIdDesc(chatRoomId, pageable);
+        Page<ChatMessage> chatMessageList = chatMessageRepository.findByChatRoomIdOrderByIdDesc(chatRoomId, pageable);
         return chatMessageConverter.toPagedChatMessageInfo(chatMessageList);
     }
 }
diff --git a/src/main/java/com/back/catchmate/domain/enroll/service/EnrollServiceImpl.java b/src/main/java/com/back/catchmate/domain/enroll/service/EnrollServiceImpl.java
index 2e45649..80a75d0 100644
--- a/src/main/java/com/back/catchmate/domain/enroll/service/EnrollServiceImpl.java
+++ b/src/main/java/com/back/catchmate/domain/enroll/service/EnrollServiceImpl.java
@@ -7,6 +7,7 @@
 import com.back.catchmate.domain.chat.entity.UserChatRoom;
 import com.back.catchmate.domain.chat.repository.ChatRoomRepository;
 import com.back.catchmate.domain.chat.repository.UserChatRoomRepository;
+import com.back.catchmate.domain.chat.service.ChatService;
 import com.back.catchmate.domain.enroll.converter.EnrollConverter;
 import com.back.catchmate.domain.enroll.dto.EnrollRequest.CreateEnrollRequest;
 import com.back.catchmate.domain.enroll.dto.EnrollResponse;
@@ -34,6 +35,7 @@
 import java.io.IOException;
 import java.util.List;
 
+import static com.back.catchmate.domain.chat.dto.ChatRequest.ChatMessageRequest.MessageType;
 import static com.back.catchmate.domain.notification.message.NotificationMessages.*;
 
 @Service
@@ -41,6 +43,7 @@
 public class EnrollServiceImpl implements EnrollService {
     private final FCMService fcmService;
     private final NotificationService notificationService;
+    private final ChatService chatService;
     private final EnrollRepository enrollRepository;
     private final UserRepository userRepository;
     private final BoardRepository boardRepository;
@@ -199,6 +202,9 @@ private void enterChatRoom(User user, Board board) {
 
         UserChatRoom userChatRoom = userChatRoomConverter.toEntity(user, chatRoom);
         userChatRoomRepository.save(userChatRoom);
+
+        String content = user.getNickName() + " 님이 채팅에 참여했어요";
+        chatService.sendEnterLeaveMessage(chatRoom.getId(), content, user.getId(), MessageType.ENTER);
     }
 
     @Override