diff --git a/src/main/java/com/aliens/backend/chat/domain/repository/CustomMessageRepositoryImpl.java b/src/main/java/com/aliens/backend/chat/domain/repository/CustomMessageRepositoryImpl.java
index 50ac7fba..db6b7b72 100644
--- a/src/main/java/com/aliens/backend/chat/domain/repository/CustomMessageRepositoryImpl.java
+++ b/src/main/java/com/aliens/backend/chat/domain/repository/CustomMessageRepositoryImpl.java
@@ -55,6 +55,7 @@ public List<ChatMessageSummary> aggregateMessageSummaries(List<Long> chatRoomIds
         AggregationOperation match = Aggregation.match(Criteria.where("roomId").in(chatRoomIds));
         AggregationOperation group = Aggregation.group("roomId")
                 .last("content").as("lastMessageContent")
+                .last("sendTime").as("lastMessageTime")
                 .sum(ConditionalOperators.when(Criteria.where("receiverId").is(memberId).and("isRead").is(false)).then(1).otherwise(0)).as("unreadCount");
         Aggregation aggregation = Aggregation.newAggregation(match, group);
         AggregationResults<ChatMessageSummary> results = mongoTemplate.aggregate(aggregation, "message", ChatMessageSummary.class);
diff --git a/src/main/java/com/aliens/backend/chat/service/model/ChatMessageSummary.java b/src/main/java/com/aliens/backend/chat/service/model/ChatMessageSummary.java
index d15d9276..a581ef0e 100644
--- a/src/main/java/com/aliens/backend/chat/service/model/ChatMessageSummary.java
+++ b/src/main/java/com/aliens/backend/chat/service/model/ChatMessageSummary.java
@@ -1,4 +1,6 @@
 package com.aliens.backend.chat.service.model;
 
-public record ChatMessageSummary(Long roomId, String lastMessageContent, Long numberOfUnreadMessages) {
+import java.util.Date;
+
+public record ChatMessageSummary(Long roomId, String lastMessageContent, Date lastMessageTime, Long numberOfUnreadMessages) {
 }
\ No newline at end of file
diff --git a/src/test/java/com/aliens/backend/chatting/service/ChatServiceTest.java b/src/test/java/com/aliens/backend/chatting/service/ChatServiceTest.java
index eb049c70..d5cdda54 100644
--- a/src/test/java/com/aliens/backend/chatting/service/ChatServiceTest.java
+++ b/src/test/java/com/aliens/backend/chatting/service/ChatServiceTest.java
@@ -18,6 +18,7 @@
 import org.junit.jupiter.api.Test;
 import org.springframework.beans.factory.annotation.Autowired;
 
+import java.util.Date;
 import java.util.List;
 
 import static org.mockito.ArgumentMatchers.any;
@@ -36,10 +37,11 @@ void setUp() {
         receiver = dummyGenerator.generateSingleMember();;
 
         Message message = Message.of(makeMessageSendRequest());
+        Date now = new Date();
         doReturn(message).when(messageRepository).save(any());
         doNothing().when(messageRepository).markMessagesAsRead(any(),any());
 
-        ChatMessageSummary summary = new ChatMessageSummary(1L,"g",1L);
+        ChatMessageSummary summary = new ChatMessageSummary(1L,"this is the last message", now,1L);
         List<ChatMessageSummary> givenSummary = List.of(summary,summary) ;
         doReturn(givenSummary).when(messageRepository).aggregateMessageSummaries(any(),any());
 
diff --git a/src/test/java/com/aliens/backend/docs/ChatRestDocsTest.java b/src/test/java/com/aliens/backend/docs/ChatRestDocsTest.java
index 8be18efc..2c6e3687 100644
--- a/src/test/java/com/aliens/backend/docs/ChatRestDocsTest.java
+++ b/src/test/java/com/aliens/backend/docs/ChatRestDocsTest.java
@@ -14,6 +14,7 @@
 
 import java.util.ArrayList;
 import java.util.Arrays;
+import java.util.Date;
 import java.util.List;
 
 import static org.mockito.ArgumentMatchers.any;
@@ -77,10 +78,11 @@ void getChatSummary() throws Exception {
         when(chatRoom2.getStatus()).thenReturn(ChatRoomStatus.OPEN);
         chatRooms.add(chatRoom1);
         chatRooms.add(chatRoom2);
+        Date now = new Date();
 
         List<ChatMessageSummary> chatMessageSummaries = List.of(
-                new ChatMessageSummary(1L, "Last message in Room 1", 5L),
-                new ChatMessageSummary(2L, "Last message in Room 2", 3L)
+                new ChatMessageSummary(1L, "Last message in Room 1", now, 5L),
+                new ChatMessageSummary(2L, "Last message in Room 2", new Date(now.getTime() - 3600000), 3L)
         );
 
         ChatSummaryResponse result = new ChatSummaryResponse(chatRooms, chatMessageSummaries);
@@ -103,6 +105,7 @@ void getChatSummary() throws Exception {
                                 fieldWithPath("result.chatMessageSummaries").description("각 채팅방의 요약 정보"),
                                 fieldWithPath("result.chatMessageSummaries[].roomId").description("채팅방 ID"),
                                 fieldWithPath("result.chatMessageSummaries[].lastMessageContent").description("채팅방의 마지막 메시지 내용"),
+                                fieldWithPath("result.chatMessageSummaries[].lastMessageTime").description("채팅방의 마지막 메시지 시간"),
                                 fieldWithPath("result.chatMessageSummaries[].numberOfUnreadMessages").description("읽지 않은 메시지의 수")
                         )
                 ));