diff --git a/api/src/main/java/com/teamnexters/lazy/api/controller/MemberController.java b/api/src/main/java/com/teamnexters/lazy/api/controller/MemberController.java
index 69e6b64..8cb9b0d 100644
--- a/api/src/main/java/com/teamnexters/lazy/api/controller/MemberController.java
+++ b/api/src/main/java/com/teamnexters/lazy/api/controller/MemberController.java
@@ -4,6 +4,7 @@
 import com.teamnexters.lazy.api.exception.MemberNotFoundException;
 import com.teamnexters.lazy.api.service.MemberService;
 import com.teamnexters.lazy.common.domain.member.Member;
+import com.teamnexters.lazy.common.error.ErrorResponse;
 import io.swagger.v3.oas.annotations.Operation;
 import io.swagger.v3.oas.annotations.Parameter;
 import io.swagger.v3.oas.annotations.media.Content;
@@ -34,7 +35,9 @@ public class MemberController {
             responses = {
                     @ApiResponse(
                             responseCode = "200", description = "[Ok] Get One Member Info",
-                            content = @Content(schema = @Schema(implementation = MemberDto.AllMemberRes.class)))})
+                            content = @Content(schema = @Schema(implementation = MemberDto.AllMemberRes.class))),
+                    @ApiResponse(responseCode = "414", description = "[Error] 존재하지 않는 회원입니다.",
+                            content = @Content(schema = @Schema(implementation = ErrorResponse.class)))})
     @GetMapping("/v1/member")
     public ResponseEntity<Member> getOneMember(
             @Parameter(hidden = true) Authentication authentication) {
@@ -44,19 +47,20 @@ public ResponseEntity<Member> getOneMember(
         if (member == null) {
             throw new MemberNotFoundException("Auth");
         } else {
-            log.info(">>> Member info : {}", member);
+            log.debug(">>> Member info : {}", member);
             return ResponseEntity.ok().body(member);
         }
     }
 
-
     @Operation(summary = "✅ 닉네임 수정 API",
             description = "회원의 닉네임을 수정해요.",
             security = @SecurityRequirement(name = "bearerAuth"),
             responses = {
                     @ApiResponse(
                             responseCode = "200", description = "[Ok] Update Member NickName",
-                            content = @Content(schema = @Schema(implementation = MemberDto.MemberIndexRes.class)))})
+                            content = @Content(schema = @Schema(implementation = MemberDto.MemberIndexRes.class))),
+                    @ApiResponse(responseCode = "411", description = "[Error] 이미 등록된 닉네임입니다.",
+                            content = @Content(schema = @Schema(implementation = ErrorResponse.class)))})
     @PutMapping("/v1/member")
     public ResponseEntity<Long> updateMemberNickName(
             @Parameter(hidden = true) Authentication authentication,
@@ -68,4 +72,23 @@ public ResponseEntity<Long> updateMemberNickName(
         memberService.updateNickName(dto, memIdx);
         return ResponseEntity.ok().body(memIdx);
     }
-}
+
+    @Operation(summary = "✅ 닉네임 중복체크 API",
+            description = "닉네임이 중복됐는지 검사해요.(중복 : true)",
+            security = @SecurityRequirement(name = "bearerAuth"),
+            responses = {
+                    @ApiResponse(
+                            responseCode = "200", description = "[Ok] Check Member NickName",
+                            content = @Content(schema = @Schema(implementation = Boolean.class)))})
+    @GetMapping("/v1/member/{nickname}")
+    public ResponseEntity<Boolean> checkNickNameDuplication(
+            @Parameter(hidden = true) Authentication authentication,
+            @Parameter(description = "체크할 닉네임", required = true) @PathVariable(name="nickname") String nickName) {
+        Member member = (Member) authentication.getPrincipal();
+        Long memIdx = member.getMemIdx();
+        log.debug(">>> Check Member No [{}] NickName : {}", memIdx, nickName);
+
+        return ResponseEntity.ok().body(memberService.isExistedNickName(nickName));
+    }
+
+}
\ No newline at end of file
diff --git a/api/src/main/java/com/teamnexters/lazy/api/domain/MemberDto.java b/api/src/main/java/com/teamnexters/lazy/api/domain/MemberDto.java
index 33931c3..e196667 100644
--- a/api/src/main/java/com/teamnexters/lazy/api/domain/MemberDto.java
+++ b/api/src/main/java/com/teamnexters/lazy/api/domain/MemberDto.java
@@ -24,6 +24,18 @@ public static class UpdateNickNameReq {
         private String nickName;
     }
 
+    /**
+     * 중복 체크할 닉네임 Dto
+     */
+    @Getter
+    @NoArgsConstructor(access = AccessLevel.PROTECTED)
+    @AllArgsConstructor
+    @Schema(description = "Request to check duplication NickName")
+    public static class checkNickNameReq {
+        @Schema(description = "회원 닉네임", defaultValue = "체크할 닉네임")
+        private String nickName;
+    }
+
     /**
      * 회원 데이터 Dto
      */
@@ -61,4 +73,5 @@ public static class MemberIndexRes {
         @Schema(description = "회원 번호", defaultValue = "2")
         private final Long memIdx;
     }
+
 }