diff --git a/src/main/java/com/bbteam/budgetbuddies/domain/comment/controller/CommentController.java b/src/main/java/com/bbteam/budgetbuddies/domain/comment/controller/CommentController.java
index 3d96a560..ece131ec 100644
--- a/src/main/java/com/bbteam/budgetbuddies/domain/comment/controller/CommentController.java
+++ b/src/main/java/com/bbteam/budgetbuddies/domain/comment/controller/CommentController.java
@@ -5,7 +5,8 @@
 import com.bbteam.budgetbuddies.domain.comment.dto.CommentResponseDto;
 import com.bbteam.budgetbuddies.domain.comment.service.CommentService;
 import com.bbteam.budgetbuddies.domain.comment.validation.ExistComment;
-import com.bbteam.budgetbuddies.domain.user.validation.ExistUser;
+import com.bbteam.budgetbuddies.domain.user.dto.UserDto;
+import com.bbteam.budgetbuddies.global.security.utils.AuthUser;
 import jakarta.validation.Valid;
 import org.springframework.beans.factory.annotation.Qualifier;
 import org.springframework.data.domain.Page;
@@ -36,9 +37,9 @@ public CommentController(CommentService<CommentRequestDto.DiscountInfoCommentReq
 
     @PostMapping("/discounts/comments")
     public ApiResponse<CommentResponseDto.DiscountInfoCommentResponseDto> saveDiscountInfoComment(
-            @RequestParam("userId") @ExistUser Long userId,
+            @AuthUser UserDto.AuthUserDto userDto,
             @RequestBody CommentRequestDto.DiscountInfoCommentRequestDto discountInfoCommentRequestDto){
-        CommentResponseDto.DiscountInfoCommentResponseDto dto = discountCommentService.saveComment(userId, discountInfoCommentRequestDto);
+        CommentResponseDto.DiscountInfoCommentResponseDto dto = discountCommentService.saveComment(userDto.getId(), discountInfoCommentRequestDto);
         return ApiResponse.onSuccess(dto);
     }
 
@@ -54,9 +55,9 @@ public ApiResponse<Page<CommentResponseDto.DiscountInfoCommentResponseDto>> find
 
     @PostMapping("/supports/comments")
     public ApiResponse<CommentResponseDto.SupportInfoCommentResponseDto> saveSupportInfoComment(
-            @RequestParam("userId") @ExistUser Long userId,
+            @AuthUser UserDto.AuthUserDto userDto,
             @RequestBody CommentRequestDto.SupportInfoCommentRequestDto supportInfoCommentRequestDto){
-        CommentResponseDto.SupportInfoCommentResponseDto dto = supportCommentService.saveComment(userId, supportInfoCommentRequestDto);
+        CommentResponseDto.SupportInfoCommentResponseDto dto = supportCommentService.saveComment(userDto.getId(), supportInfoCommentRequestDto);
         return ApiResponse.onSuccess(dto);
     }
 
diff --git a/src/main/java/com/bbteam/budgetbuddies/domain/comment/controller/CommentControllerApi.java b/src/main/java/com/bbteam/budgetbuddies/domain/comment/controller/CommentControllerApi.java
index b8279e41..69336b43 100644
--- a/src/main/java/com/bbteam/budgetbuddies/domain/comment/controller/CommentControllerApi.java
+++ b/src/main/java/com/bbteam/budgetbuddies/domain/comment/controller/CommentControllerApi.java
@@ -5,7 +5,8 @@
 import com.bbteam.budgetbuddies.domain.comment.dto.CommentRequestDto;
 import com.bbteam.budgetbuddies.domain.comment.dto.CommentResponseDto;
 import com.bbteam.budgetbuddies.domain.comment.validation.ExistComment;
-import com.bbteam.budgetbuddies.domain.user.validation.ExistUser;
+import com.bbteam.budgetbuddies.domain.user.dto.UserDto;
+import com.bbteam.budgetbuddies.global.security.utils.AuthUser;
 import io.swagger.v3.oas.annotations.Operation;
 import io.swagger.v3.oas.annotations.Parameter;
 import io.swagger.v3.oas.annotations.Parameters;
@@ -24,12 +25,11 @@ public interface CommentControllerApi {
             @io.swagger.v3.oas.annotations.responses.ApiResponse(responseCode = "COMMON200", description = "OK, 성공"),
     })
     @Parameters({
-            @Parameter(name = "userId", description = "현재 댓글을 다는 유저 id입니다. parameter"),
             @Parameter(name = "discountInfoId", description = "댓글을 다는 할인 정보 게시글 id입니다. requestBody"),
             @Parameter(name = "content", description = "댓글 내용입니다. requestBody"),
     })
     ApiResponse<CommentResponseDto.DiscountInfoCommentResponseDto> saveDiscountInfoComment(
-            @ExistUser Long userId,
+            @AuthUser UserDto.AuthUserDto userDto,
             CommentRequestDto.DiscountInfoCommentRequestDto discountInfoCommentRequestDto);
 
 
@@ -51,12 +51,11 @@ ApiResponse<Page<CommentResponseDto.DiscountInfoCommentResponseDto>> findAllByDi
             @io.swagger.v3.oas.annotations.responses.ApiResponse(responseCode = "COMMON200", description = "OK, 성공"),
     })
     @Parameters({
-            @Parameter(name = "userId", description = "현재 댓글을 다는 유저 id입니다. parameter"),
             @Parameter(name = "supportInfoId", description = "댓글을 다는 지원 정보 게시글 id입니다. requestBody"),
             @Parameter(name = "content", description = "댓글 내용입니다. requestBody"),
     })
     ApiResponse<CommentResponseDto.SupportInfoCommentResponseDto> saveSupportInfoComment(
-            @ExistUser Long userId,
+            @AuthUser UserDto.AuthUserDto userDto,
             CommentRequestDto.SupportInfoCommentRequestDto supportInfoCommentRequestDto);
 
     @Operation(summary = "[User] 특정 지원 정보 게시글의 댓글 조회하기", description = "특정 지원 정보 게시글의 댓글을 가져오는 API입니다.")
diff --git a/src/main/java/com/bbteam/budgetbuddies/domain/faq/controller/FaqApi.java b/src/main/java/com/bbteam/budgetbuddies/domain/faq/controller/FaqApi.java
index 8485960f..1f2d5fb7 100644
--- a/src/main/java/com/bbteam/budgetbuddies/domain/faq/controller/FaqApi.java
+++ b/src/main/java/com/bbteam/budgetbuddies/domain/faq/controller/FaqApi.java
@@ -4,7 +4,8 @@
 import com.bbteam.budgetbuddies.apiPayload.ApiResponse;
 import com.bbteam.budgetbuddies.domain.faq.dto.FaqRequestDto;
 import com.bbteam.budgetbuddies.domain.faq.validation.ExistFaq;
-import com.bbteam.budgetbuddies.domain.user.validation.ExistUser;
+import com.bbteam.budgetbuddies.domain.user.dto.UserDto;
+import com.bbteam.budgetbuddies.global.security.utils.AuthUser;
 import io.swagger.v3.oas.annotations.Operation;
 import io.swagger.v3.oas.annotations.Parameter;
 import io.swagger.v3.oas.annotations.Parameters;
@@ -44,11 +45,7 @@ public interface FaqApi {
     @ApiResponses({
             @io.swagger.v3.oas.annotations.responses.ApiResponse(responseCode = "COMMON200", description = "OK, 성공"),
     })
-    @Parameters({
-            @Parameter(name = "userId", description = "FAQ를 사용하는 userId입니다.. pathVariable", in = ParameterIn.QUERY),
-    }
-    )
-    ApiResponse<?> postFaq(@ExistUser @RequestParam Long userId,
+    ApiResponse<?> postFaq(@AuthUser UserDto.AuthUserDto userDto,
                            @Valid @org.springframework.web.bind.annotation.RequestBody FaqRequestDto.FaqPostRequest dto);
     @Operation(summary = "[Admin] FAQ 조회 API", description = "FAQ를 조회하는 API입니다."
     )
diff --git a/src/main/java/com/bbteam/budgetbuddies/domain/faq/controller/FaqController.java b/src/main/java/com/bbteam/budgetbuddies/domain/faq/controller/FaqController.java
index c15fe5d2..5c0b1a1b 100644
--- a/src/main/java/com/bbteam/budgetbuddies/domain/faq/controller/FaqController.java
+++ b/src/main/java/com/bbteam/budgetbuddies/domain/faq/controller/FaqController.java
@@ -5,9 +5,9 @@
 import com.bbteam.budgetbuddies.domain.faq.dto.FaqResponseDto;
 import com.bbteam.budgetbuddies.domain.faq.service.FaqService;
 import com.bbteam.budgetbuddies.domain.faq.validation.ExistFaq;
-import com.bbteam.budgetbuddies.domain.user.validation.ExistUser;
+import com.bbteam.budgetbuddies.domain.user.dto.UserDto;
+import com.bbteam.budgetbuddies.global.security.utils.AuthUser;
 import jakarta.validation.Valid;
-import jakarta.validation.constraints.Null;
 import lombok.RequiredArgsConstructor;
 import org.springdoc.core.annotations.ParameterObject;
 import org.springframework.data.domain.Page;
@@ -26,9 +26,9 @@ public class FaqController implements FaqApi{
 
     @Override
     @PostMapping("")
-    public ApiResponse<FaqResponseDto.FaqPostResponse> postFaq(@ExistUser @RequestParam Long userId,
+    public ApiResponse<FaqResponseDto.FaqPostResponse> postFaq(@AuthUser UserDto.AuthUserDto userDto,
                                                                @Valid @RequestBody FaqRequestDto.FaqPostRequest dto) {
-        return ApiResponse.onSuccess(faqService.postFaq(dto, userId));
+        return ApiResponse.onSuccess(faqService.postFaq(dto, userDto.getId()));
     }
 
     @Override
diff --git a/src/main/java/com/bbteam/budgetbuddies/domain/mainpage/controller/MainPageApi.java b/src/main/java/com/bbteam/budgetbuddies/domain/mainpage/controller/MainPageApi.java
index 757722f8..9caf9f26 100644
--- a/src/main/java/com/bbteam/budgetbuddies/domain/mainpage/controller/MainPageApi.java
+++ b/src/main/java/com/bbteam/budgetbuddies/domain/mainpage/controller/MainPageApi.java
@@ -2,13 +2,10 @@
 
 import com.bbteam.budgetbuddies.apiPayload.ApiResponse;
 import com.bbteam.budgetbuddies.domain.mainpage.dto.MainPageResponseDto;
-import com.bbteam.budgetbuddies.domain.user.validation.ExistUser;
+import com.bbteam.budgetbuddies.domain.user.dto.UserDto;
+import com.bbteam.budgetbuddies.global.security.utils.AuthUser;
 import io.swagger.v3.oas.annotations.Operation;
-import io.swagger.v3.oas.annotations.Parameter;
-import io.swagger.v3.oas.annotations.Parameters;
 import io.swagger.v3.oas.annotations.responses.ApiResponses;
-import org.springframework.http.ResponseEntity;
-import org.springframework.web.bind.annotation.RequestParam;
 
 public interface MainPageApi {
 
@@ -16,8 +13,5 @@ public interface MainPageApi {
     @ApiResponses({
             @io.swagger.v3.oas.annotations.responses.ApiResponse(responseCode = "COMMON200", description = "OK, 성공"),
     })
-    @Parameters({
-            @Parameter(name = "userId", description = "현재 데이터를 요청하는 사용자입니다. parameter"),
-    })
-    ApiResponse<MainPageResponseDto> getMainPage(@RequestParam("userId") @ExistUser Long userId);
+    ApiResponse<MainPageResponseDto> getMainPage(@AuthUser UserDto.AuthUserDto userDto);
 }
diff --git a/src/main/java/com/bbteam/budgetbuddies/domain/mainpage/controller/MainPageController.java b/src/main/java/com/bbteam/budgetbuddies/domain/mainpage/controller/MainPageController.java
index 534bb66a..1be20827 100644
--- a/src/main/java/com/bbteam/budgetbuddies/domain/mainpage/controller/MainPageController.java
+++ b/src/main/java/com/bbteam/budgetbuddies/domain/mainpage/controller/MainPageController.java
@@ -3,13 +3,11 @@
 import com.bbteam.budgetbuddies.apiPayload.ApiResponse;
 import com.bbteam.budgetbuddies.domain.mainpage.dto.MainPageResponseDto;
 import com.bbteam.budgetbuddies.domain.mainpage.service.MainPageService;
-import com.bbteam.budgetbuddies.domain.user.validation.ExistUser;
+import com.bbteam.budgetbuddies.domain.user.dto.UserDto;
+import com.bbteam.budgetbuddies.global.security.utils.AuthUser;
 import lombok.RequiredArgsConstructor;
-import org.springframework.http.ResponseEntity;
 import org.springframework.validation.annotation.Validated;
 import org.springframework.web.bind.annotation.GetMapping;
-import org.springframework.web.bind.annotation.RequestMapping;
-import org.springframework.web.bind.annotation.RequestParam;
 import org.springframework.web.bind.annotation.RestController;
 
 @RestController
@@ -21,8 +19,8 @@ public class MainPageController implements MainPageApi{
 
     @GetMapping("/main")
     public ApiResponse<MainPageResponseDto> getMainPage
-            (@RequestParam("userId") @ExistUser Long userId) {
-        MainPageResponseDto mainPage = mainPageService.getMainPage(userId);
+            (@AuthUser UserDto.AuthUserDto userDto) {
+        MainPageResponseDto mainPage = mainPageService.getMainPage(userDto.getId());
         return ApiResponse.onSuccess(mainPage);
     }
 }