diff --git a/src/main/java/site/goldenticket/common/response/ErrorCode.java b/src/main/java/site/goldenticket/common/response/ErrorCode.java
index 1f4ab08b..a41f349c 100644
--- a/src/main/java/site/goldenticket/common/response/ErrorCode.java
+++ b/src/main/java/site/goldenticket/common/response/ErrorCode.java
@@ -42,6 +42,7 @@ public enum ErrorCode {
     NO_TRANSFER_PENDING_NEGO(BAD_REQUEST, "양도 대기중인 네고가 없습니다."),
     NO_REGISTERED_ACCOUNT(NOT_FOUND, "등록된 계좌가 없습니다"),
     TRANSFER_PENDING_NEGO(BAD_REQUEST,"양도 대기 중인 상품이 있어 결제할 수 없습니다."),
+    CANNOT_NEGOTIATE_SELF_PRODUCT(BAD_REQUEST, "자신의 상품에는 네고를 할 수 없습니다."),
 
 
     // Auth
diff --git a/src/main/java/site/goldenticket/domain/nego/service/NegoServiceImpl.java b/src/main/java/site/goldenticket/domain/nego/service/NegoServiceImpl.java
index ded4538f..507f44ce 100644
--- a/src/main/java/site/goldenticket/domain/nego/service/NegoServiceImpl.java
+++ b/src/main/java/site/goldenticket/domain/nego/service/NegoServiceImpl.java
@@ -120,6 +120,11 @@ public PriceProposeResponse proposePrice(Long productId, PriceProposeRequest req
                 .orElseThrow(() -> new NoSuchElementException("Nego not found with id: " + userId));
 
         Product product = productService.getProduct(productId);
+        Long productUserId = product.getUserId();
+
+        if(userId.equals(productUserId)){
+            throw new CustomException("자신의 상품에는 네고를 할 수 없습니다.", ErrorCode.CANNOT_NEGOTIATE_SELF_PRODUCT);
+        }
 
         List<Nego> allNegosForProduct = negoRepository.findAllByProduct(product);
         for (Nego nego : allNegosForProduct) {