diff --git a/tht-apis/src/main/java/com/tht/thtapis/facade/chat/ChatFacade.java b/tht-apis/src/main/java/com/tht/thtapis/facade/chat/ChatFacade.java
index 6e9de1ef..2067a055 100644
--- a/tht-apis/src/main/java/com/tht/thtapis/facade/chat/ChatFacade.java
+++ b/tht-apis/src/main/java/com/tht/thtapis/facade/chat/ChatFacade.java
@@ -1,6 +1,8 @@
 package com.tht.thtapis.facade.chat;
 
 import com.tht.domain.entity.chat.group.ChatRoomMapperGroup;
+import com.tht.domain.entity.chat.mapper.ChatRoomUserMapper;
+import com.tht.domain.entity.user.User;
 import com.tht.thtapis.facade.Facade;
 import com.tht.thtapis.facade.chat.group.ChatHistoryGroup;
 import com.tht.thtapis.facade.chat.group.ChatRoomPreviewMapperGroup;
@@ -58,8 +60,9 @@ public ChatRoomResponse findMyRoomDetail(final long chatRoomIdx, final String us
 
         chatRoomService.existBy(chatRoomIdx);
 
-        ChatRoomMapperGroup group = chatRoomService.findDetailInfoById(chatRoomIdx, userUuid);
+        final ChatRoomMapperGroup group = chatRoomService.findDetailInfoById(chatRoomIdx, userUuid);
+        final List<ChatRoomUserMapper> allParticipator = chatRoomUserService.findAllParticipator(chatRoomIdx);
 
-        return ChatRoomResponse.of(group.getBasic(), group.isChatAble());
+        return ChatRoomResponse.of(group.getBasic(), group.isChatAble(), allParticipator);
     }
 }
diff --git a/tht-apis/src/main/java/com/tht/thtapis/facade/chat/response/ChatRoomResponse.java b/tht-apis/src/main/java/com/tht/thtapis/facade/chat/response/ChatRoomResponse.java
index 63e61202..e34da6a8 100644
--- a/tht-apis/src/main/java/com/tht/thtapis/facade/chat/response/ChatRoomResponse.java
+++ b/tht-apis/src/main/java/com/tht/thtapis/facade/chat/response/ChatRoomResponse.java
@@ -1,24 +1,40 @@
 package com.tht.thtapis.facade.chat.response;
 
 import com.tht.domain.entity.chat.mapper.ChatRoomMapper;
+import com.tht.domain.entity.chat.mapper.ChatRoomUserMapper;
+import com.tht.domain.entity.user.User;
 
 import java.time.format.DateTimeFormatter;
+import java.util.List;
 
 public record ChatRoomResponse(
     long chatRoomIdx,
     String talkSubject,
     String talkIssue,
     String startDate,
-    boolean isChatAble
+    boolean isChatAble,
+    List<Participant> participants
 ) {
 
-    public static ChatRoomResponse of(final ChatRoomMapper mapper, final boolean isChatAble) {
+    public static ChatRoomResponse of(final ChatRoomMapper mapper, final boolean isChatAble, List<ChatRoomUserMapper> allParticipator) {
         return new ChatRoomResponse(
             mapper.chatRoomIdx(),
             mapper.talkSubject(),
             mapper.talkIssue(),
             mapper.startDate().format(DateTimeFormatter.ofPattern("y년 M월 d일")),
-            isChatAble
+            isChatAble,
+            allParticipator.stream().map(Participant::of).toList()
         );
     }
 }
+
+record Participant(
+    String userUuid,
+    String userName,
+    String profileUrl
+) {
+
+    public static Participant of(final ChatRoomUserMapper user) {
+        return new Participant(user.userUuid(), user.userName(), user.profileUrl());
+    }
+}
diff --git a/tht-apis/src/test/java/com/tht/thtapis/documentation/ChatDocumentation.java b/tht-apis/src/test/java/com/tht/thtapis/documentation/ChatDocumentation.java
index a50e9488..e6f1cbc5 100644
--- a/tht-apis/src/test/java/com/tht/thtapis/documentation/ChatDocumentation.java
+++ b/tht-apis/src/test/java/com/tht/thtapis/documentation/ChatDocumentation.java
@@ -183,7 +183,11 @@ void getDetailRoomInfo() throws Exception {
                             fieldWithPath("talkSubject").description("대화 주제"),
                             fieldWithPath("talkIssue").description("대화 주제 파생질문"),
                             fieldWithPath("startDate").description("재화 시작일"),
-                            fieldWithPath("isChatAble").description("채팅 가능여부")
+                            fieldWithPath("isChatAble").description("채팅 가능여부"),
+                            fieldWithPath("participants").description("채팅방 참가자 리스트"),
+                            fieldWithPath("participants[].userUuid").description("참가자 고유 번호"),
+                            fieldWithPath("participants[].userName").description("참가자 이름"),
+                            fieldWithPath("participants[].profileUrl").description("참가자 프로필 대표사진 url")
                         )
                         .build()
                 )
diff --git a/tht-apis/src/test/java/com/tht/thtapis/facade/chat/ChatFacadeTest.java b/tht-apis/src/test/java/com/tht/thtapis/facade/chat/ChatFacadeTest.java
index 0a1b9a06..807ce32d 100644
--- a/tht-apis/src/test/java/com/tht/thtapis/facade/chat/ChatFacadeTest.java
+++ b/tht-apis/src/test/java/com/tht/thtapis/facade/chat/ChatFacadeTest.java
@@ -1,6 +1,7 @@
 package com.tht.thtapis.facade.chat;
 
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.hamcrest.MatcherAssert.assertThat;
 import static org.mockito.ArgumentMatchers.anyList;
 import static org.mockito.BDDMockito.anyInt;
 import static org.mockito.BDDMockito.anyLong;
diff --git a/tht-apis/src/test/java/com/tht/thtapis/fixture/chat/ChatRoomResponseFixture.java b/tht-apis/src/test/java/com/tht/thtapis/fixture/chat/ChatRoomResponseFixture.java
index 0456b50a..d7aceab3 100644
--- a/tht-apis/src/test/java/com/tht/thtapis/fixture/chat/ChatRoomResponseFixture.java
+++ b/tht-apis/src/test/java/com/tht/thtapis/fixture/chat/ChatRoomResponseFixture.java
@@ -1,5 +1,8 @@
 package com.tht.thtapis.fixture.chat;
 
+import com.tht.domain.entity.chat.mapper.ChatRoomMapper;
+import com.tht.domain.entity.chat.mapper.ChatRoomUserMapper;
+import com.tht.enums.EntityState;
 import com.tht.thtapis.facade.chat.response.ChatRoomPreviewResponse;
 import com.tht.thtapis.facade.chat.response.ChatRoomResponse;
 
@@ -29,6 +32,13 @@ public static List<ChatRoomPreviewResponse> makePreviewResponseList() {
     }
 
     public static ChatRoomResponse make() {
-        return new ChatRoomResponse(chatRoomIdx,talkSubject, talkIssue, startDate, isChatAble);
+        List<ChatRoomUserMapper> users = List.of(
+            new ChatRoomUserMapper("1번-user-uuid", "1번 참가자 이름", "1번 참가자 대표 사진"),
+            new ChatRoomUserMapper("2번-user-uuid", "2번 참가자 이름", "2번 참가자 대표 사진")
+        );
+
+        ChatRoomMapper chatRoomMapper = new ChatRoomMapper(chatRoomIdx, talkSubject, talkIssue, LocalDateTime.now(), EntityState.ACTIVE, EntityState.ACTIVE);
+
+        return ChatRoomResponse.of(chatRoomMapper, isChatAble, users);
     }
 }
diff --git a/tht-core/domain/src/main/java/com/tht/domain/entity/chat/mapper/ChatRoomUserMapper.java b/tht-core/domain/src/main/java/com/tht/domain/entity/chat/mapper/ChatRoomUserMapper.java
new file mode 100644
index 00000000..7bb2c131
--- /dev/null
+++ b/tht-core/domain/src/main/java/com/tht/domain/entity/chat/mapper/ChatRoomUserMapper.java
@@ -0,0 +1,13 @@
+package com.tht.domain.entity.chat.mapper;
+
+import com.querydsl.core.annotations.QueryProjection;
+
+public record ChatRoomUserMapper(
+    String userUuid,
+    String userName,
+    String profileUrl
+) {
+
+    @QueryProjection
+    public ChatRoomUserMapper {}
+}
diff --git a/tht-core/domain/src/main/java/com/tht/domain/entity/chat/repository/ChatRoomUserCustomRepository.java b/tht-core/domain/src/main/java/com/tht/domain/entity/chat/repository/ChatRoomUserCustomRepository.java
index eaa4494a..26d1fb98 100644
--- a/tht-core/domain/src/main/java/com/tht/domain/entity/chat/repository/ChatRoomUserCustomRepository.java
+++ b/tht-core/domain/src/main/java/com/tht/domain/entity/chat/repository/ChatRoomUserCustomRepository.java
@@ -2,6 +2,8 @@
 
 
 import com.tht.domain.entity.chat.mapper.ChatRoomPreviewMapper;
+import com.tht.domain.entity.chat.mapper.ChatRoomUserMapper;
+import com.tht.domain.entity.user.User;
 
 import java.util.List;
 
@@ -12,4 +14,6 @@ public interface ChatRoomUserCustomRepository {
     void updateChatRoomUserInActive(final long chatRoomIdx, final String userUuid);
 
     void updateChatRoomUserInActiveOfBlock(final String userUuid, final String blockUserUuid);
+
+    List<ChatRoomUserMapper> findAllActiveParticipator(final long chatRoomIdx);
 }
diff --git a/tht-core/domain/src/main/java/com/tht/domain/entity/chat/repository/querydsl/ChatRoomUserCustomRepositoryImpl.java b/tht-core/domain/src/main/java/com/tht/domain/entity/chat/repository/querydsl/ChatRoomUserCustomRepositoryImpl.java
index 1cf89ed1..fba59e7d 100644
--- a/tht-core/domain/src/main/java/com/tht/domain/entity/chat/repository/querydsl/ChatRoomUserCustomRepositoryImpl.java
+++ b/tht-core/domain/src/main/java/com/tht/domain/entity/chat/repository/querydsl/ChatRoomUserCustomRepositoryImpl.java
@@ -1,6 +1,9 @@
 package com.tht.domain.entity.chat.repository.querydsl;
 
 import com.querydsl.jpa.impl.JPAQueryFactory;
+import com.tht.domain.entity.chat.mapper.ChatRoomUserMapper;
+import com.tht.domain.entity.chat.mapper.QChatRoomUserMapper;
+import com.tht.domain.entity.user.User;
 import com.tht.enums.EntityState;
 import com.tht.domain.entity.chat.QChatRoom;
 import com.tht.domain.entity.chat.QChatRoomUser;
@@ -70,7 +73,7 @@ public void updateChatRoomUserInActive(final long chatRoomIdx, final String user
 
     @Override
     public void updateChatRoomUserInActiveOfBlock(final String userUuid,
-        final String blockUserUuid) {
+                                                  final String blockUserUuid) {
 
         final List<Long> blockUserChatRoomIdxList = queryFactory.select(chatRoomUser.chatRoomIdx)
             .from(chatRoomUser)
@@ -88,4 +91,25 @@ public void updateChatRoomUserInActiveOfBlock(final String userUuid,
             .execute();
     }
 
+    @Override
+    public List<ChatRoomUserMapper> findAllActiveParticipator(long chatRoomIdx) {
+
+        int representativePhoto = 1;
+        return queryFactory.select(
+                new QChatRoomUserMapper(
+                    user.userUuid,
+                    user.username,
+                    userProfilePhoto.url
+                )
+            )
+            .from(chatRoomUser)
+            .innerJoin(user).on(chatRoomUser.userUuid.eq(user.userUuid))
+            .innerJoin(userProfilePhoto).on(user.userUuid.eq(userProfilePhoto.userUuid).and(userProfilePhoto.priority.eq(representativePhoto)))
+            .where(
+                chatRoomUser.chatRoomIdx.eq(chatRoomIdx),
+                chatRoomUser.state.eq(EntityState.ACTIVE)
+            )
+            .fetch();
+    }
+
 }
diff --git a/tht-core/domain/src/main/java/com/tht/domain/entity/chat/service/ChatRoomUserService.java b/tht-core/domain/src/main/java/com/tht/domain/entity/chat/service/ChatRoomUserService.java
index be99e572..536d712c 100644
--- a/tht-core/domain/src/main/java/com/tht/domain/entity/chat/service/ChatRoomUserService.java
+++ b/tht-core/domain/src/main/java/com/tht/domain/entity/chat/service/ChatRoomUserService.java
@@ -4,7 +4,9 @@
 
 import com.tht.domain.entity.chat.ChatRoomUser;
 import com.tht.domain.entity.chat.mapper.ChatRoomPreviewMapper;
+import com.tht.domain.entity.chat.mapper.ChatRoomUserMapper;
 import com.tht.domain.entity.chat.repository.ChatRoomUserRepository;
+import com.tht.domain.entity.user.User;
 import lombok.RequiredArgsConstructor;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
@@ -31,4 +33,8 @@ public void inChatRoom(final long chatRoomIdx, final String userUuid) {
     public void outOfBlockChatRoom(final String userUuid, final String blockUserUuid) {
         chatRoomUserRepository.updateChatRoomUserInActiveOfBlock(userUuid, blockUserUuid);
     }
+
+    public List<ChatRoomUserMapper> findAllParticipator(final long chatRoomIdx) {
+        return chatRoomUserRepository.findAllActiveParticipator(chatRoomIdx);
+    }
 }