diff --git a/src/main/java/com/brainpix/post/controller/CollaborationHubQueryController.java b/src/main/java/com/brainpix/post/controller/CollaborationHubQueryController.java
index 9aceb048..0efeaf95 100644
--- a/src/main/java/com/brainpix/post/controller/CollaborationHubQueryController.java
+++ b/src/main/java/com/brainpix/post/controller/CollaborationHubQueryController.java
@@ -26,6 +26,7 @@
 
 import io.swagger.v3.oas.annotations.Operation;
 import io.swagger.v3.oas.annotations.tags.Tag;
+import jakarta.validation.Valid;
 import lombok.RequiredArgsConstructor;
 
 @RestController
@@ -42,7 +43,7 @@ public class CollaborationHubQueryController {
 	public ResponseEntity<ApiResponse<ApplyCollaborationDto.Response>> applyCollaboration(
 		@PathVariable("collaborationId") Long collaborationId,
 		@RequestParam("userId") Long userId,
-		@RequestBody ApplyCollaborationDto.Request request) {
+		@RequestBody @Valid ApplyCollaborationDto.Request request) {
 		ApplyCollaborationDto.Parameter parameter = ApplyCollaborationDtoConverter.toParameter(collaborationId, userId,
 			request);
 		ApplyCollaborationDto.Response response = collaborationHubService.applyCollaboration(parameter);
diff --git a/src/main/java/com/brainpix/post/dto/ApplyCollaborationDto.java b/src/main/java/com/brainpix/post/dto/ApplyCollaborationDto.java
index 3a9596da..695b2ce5 100644
--- a/src/main/java/com/brainpix/post/dto/ApplyCollaborationDto.java
+++ b/src/main/java/com/brainpix/post/dto/ApplyCollaborationDto.java
@@ -14,7 +14,6 @@ public static class Request {
 		Long collaborationRecruitmentId;    // 지원 분야 식별자
 		@NotNull(message = "자기소개 및 포트폴리오 공개 여부를 결정해주세요.")
 		Boolean isOpenProfile;    // 자기소개 및 포트폴리오 공개 여부
-		@NotNull(message = "메시지에 null 값은 허용되지 않습니다.")
 		String message;    // 추가 메시지
 	}
 
diff --git a/src/main/java/com/brainpix/post/dto/ApplyRequestTaskDto.java b/src/main/java/com/brainpix/post/dto/ApplyRequestTaskDto.java
index 47261765..5c34cc3a 100644
--- a/src/main/java/com/brainpix/post/dto/ApplyRequestTaskDto.java
+++ b/src/main/java/com/brainpix/post/dto/ApplyRequestTaskDto.java
@@ -14,7 +14,6 @@ public static class Request {
 		Long requestRecruitmentId;    // 지원 분야 식별자
 		@NotNull(message = "자기소개 및 포트폴리오 공개 여부를 결정해주세요.")
 		Boolean isOpenProfile;    // 자기소개 및 포트폴리오 공개 여부
-		@NotNull(message = "메시지에 null 값은 허용되지 않습니다.")
 		String message;    // 추가 메시지
 	}
 
diff --git a/src/main/java/com/brainpix/post/repository/PostRepository.java b/src/main/java/com/brainpix/post/repository/PostRepository.java
index 3ee02160..e188e701 100644
--- a/src/main/java/com/brainpix/post/repository/PostRepository.java
+++ b/src/main/java/com/brainpix/post/repository/PostRepository.java
@@ -3,6 +3,9 @@
 import org.springframework.data.domain.Page;
 import org.springframework.data.domain.Pageable;
 import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Modifying;
+import org.springframework.data.jpa.repository.Query;
+import org.springframework.data.repository.query.Param;
 
 import com.brainpix.post.entity.Post;
 import com.brainpix.user.entity.User;
@@ -10,4 +13,8 @@
 public interface PostRepository extends JpaRepository<Post, Long> {
 
 	Page<Post> findByWriter(User writer, Pageable pageable);
+
+	@Modifying
+	@Query("update Post p set p.viewCount = p.viewCount + 1 where p.id = :id")
+	Integer increaseViewCount(@Param("id") Long postId);
 }
\ No newline at end of file
diff --git a/src/main/java/com/brainpix/post/service/CollaborationHubService.java b/src/main/java/com/brainpix/post/service/CollaborationHubService.java
index 535e2001..8f5fd7ae 100644
--- a/src/main/java/com/brainpix/post/service/CollaborationHubService.java
+++ b/src/main/java/com/brainpix/post/service/CollaborationHubService.java
@@ -32,6 +32,7 @@
 import com.brainpix.post.repository.CollaborationHubRepository;
 import com.brainpix.post.repository.CollaborationRecruitmentRepository;
 import com.brainpix.post.repository.IdeaMarketRepository;
+import com.brainpix.post.repository.PostRepository;
 import com.brainpix.post.repository.SavedPostRepository;
 import com.brainpix.security.authority.BrainpixAuthority;
 import com.brainpix.user.entity.User;
@@ -54,6 +55,7 @@ public class CollaborationHubService {
 	private final IdeaMarketRepository ideaMarketRepository;
 	private final RequestTaskPurchasingRepository requestTaskPurchasingRepository;
 	private final AlarmEventService alarmEventService;
+	private final PostRepository postRepository;
 
 	@Transactional
 	public Long createCollaborationHub(Long userId, CollaborationHubCreateDto createDto) {
@@ -108,7 +110,7 @@ public CommonPageResponse<GetCollaborationHubListDto.CollaborationDetail> getCol
 		return GetCollaborationHubListDtoConverter.toResponse(result);
 	}
 
-	@Transactional(readOnly = true)
+	@Transactional
 	public GetCollaborationHubDetailDto.Response getCollaborationHubDetail(
 		GetCollaborationHubDetailDto.Parameter parameter) {
 
@@ -126,6 +128,9 @@ public GetCollaborationHubDetailDto.Response getCollaborationHubDetail(
 			throw new BrainPixException(RequestTaskErrorCode.FORBIDDEN_ACCESS);
 		}
 
+		// 조회수 증가
+		postRepository.increaseViewCount(collaborationHub.getId());
+
 		// 작성자 조회
 		User writer = collaborationHub.getWriter();
 
diff --git a/src/main/java/com/brainpix/post/service/IdeaMarketService.java b/src/main/java/com/brainpix/post/service/IdeaMarketService.java
index 0f56b6bb..8485a88e 100644
--- a/src/main/java/com/brainpix/post/service/IdeaMarketService.java
+++ b/src/main/java/com/brainpix/post/service/IdeaMarketService.java
@@ -25,6 +25,7 @@
 import com.brainpix.post.entity.PostAuth;
 import com.brainpix.post.entity.idea_market.IdeaMarket;
 import com.brainpix.post.repository.IdeaMarketRepository;
+import com.brainpix.post.repository.PostRepository;
 import com.brainpix.post.repository.SavedPostRepository;
 import com.brainpix.security.authority.BrainpixAuthority;
 import com.brainpix.user.entity.User;
@@ -43,6 +44,7 @@ public class IdeaMarketService {
 	private final PriceService priceService;
 	private final CreateIdeaMarketConverter createIdeaMarketConverter;
 	private final RequestTaskPurchasingRepository requestTaskPurchasingRepository;
+	private final PostRepository postRepository;
 
 	@Transactional
 	public Long createIdeaMarket(Long userId, IdeaMarketCreateDto createDto) {
@@ -95,7 +97,7 @@ public CommonPageResponse<GetIdeaListDto.IdeaDetail> getIdeaList(GetIdeaListDto.
 	}
 
 	// 아이디어 식별자 값을 입력받아 상세보기에 관한 내용을 반환합니다.
-	@Transactional(readOnly = true)
+	@Transactional
 	public GetIdeaDetailDto.Response getIdeaDetail(GetIdeaDetailDto.Parameter parameter) {
 
 		// 유저 조회
@@ -112,6 +114,9 @@ public GetIdeaDetailDto.Response getIdeaDetail(GetIdeaDetailDto.Parameter parame
 			throw new BrainPixException(IdeaMarketErrorCode.FORBIDDEN_ACCESS);
 		}
 
+		// 조회수 증가
+		postRepository.increaseViewCount(ideaMarket.getId());
+
 		// 작성자 조회
 		User writer = ideaMarket.getWriter();
 
diff --git a/src/main/java/com/brainpix/post/service/RequestTaskQueryService.java b/src/main/java/com/brainpix/post/service/RequestTaskQueryService.java
index 92da1b28..7fb5dc5e 100644
--- a/src/main/java/com/brainpix/post/service/RequestTaskQueryService.java
+++ b/src/main/java/com/brainpix/post/service/RequestTaskQueryService.java
@@ -19,6 +19,7 @@
 import com.brainpix.post.entity.PostAuth;
 import com.brainpix.post.entity.request_task.RequestTask;
 import com.brainpix.post.repository.IdeaMarketRepository;
+import com.brainpix.post.repository.PostRepository;
 import com.brainpix.post.repository.RequestTaskRepository;
 import com.brainpix.post.repository.SavedPostRepository;
 import com.brainpix.security.authority.BrainpixAuthority;
@@ -29,7 +30,6 @@
 
 @Service
 @RequiredArgsConstructor
-@Transactional(readOnly = true)
 public class RequestTaskQueryService {
 
 	private final RequestTaskRepository requestTaskRepository;
@@ -38,8 +38,10 @@ public class RequestTaskQueryService {
 	private final CollectionGatheringRepository collectionGatheringRepository;
 	private final UserRepository userRepository;
 	private final RequestTaskPurchasingRepository requestTaskPurchasingRepository;
+	private final PostRepository postRepository;
 
 	// 요청 과제 메인페이지에서 검색 조건을 적용하여 요청 과제 목록을 반환합니다.
+	@Transactional(readOnly = true)
 	public CommonPageResponse<GetRequestTaskListDto.RequestTaskDetail> getRequestTaskList(
 		GetRequestTaskListDto.Parameter parameter) {
 
@@ -53,6 +55,7 @@ public CommonPageResponse<GetRequestTaskListDto.RequestTaskDetail> getRequestTas
 	}
 
 	// 저장순으로 요청 과제를 조회합니다.
+	@Transactional(readOnly = true)
 	public CommonPageResponse<GetPopularRequestTaskListDto.RequestTaskDetail> getPopularRequestTaskList(
 		GetPopularRequestTaskListDto.Parameter parameter) {
 
@@ -65,6 +68,7 @@ public CommonPageResponse<GetPopularRequestTaskListDto.RequestTaskDetail> getPop
 	}
 
 	// 요청 과제 상세 페이지 내용을 조회합니다.
+	@Transactional
 	public GetRequestTaskDetailDto.Response getRequestTaskDetail(
 		GetRequestTaskDetailDto.Parameter parameter) {
 
@@ -82,6 +86,9 @@ public GetRequestTaskDetailDto.Response getRequestTaskDetail(
 			throw new BrainPixException(PostErrorCode.FORBIDDEN_ACCESS);
 		}
 
+		// 조회수 증가
+		postRepository.increaseViewCount(requestTask.getId());
+
 		// 작성자 조회
 		User writer = requestTask.getWriter();