diff --git a/backend/src/main/java/com/zzang/chongdae/global/exception/GlobalExceptionHandler.java b/backend/src/main/java/com/zzang/chongdae/global/exception/GlobalExceptionHandler.java
index c294e0155..ba748fef0 100644
--- a/backend/src/main/java/com/zzang/chongdae/global/exception/GlobalExceptionHandler.java
+++ b/backend/src/main/java/com/zzang/chongdae/global/exception/GlobalExceptionHandler.java
@@ -4,9 +4,12 @@
 import com.zzang.chongdae.logging.dto.LoggingErrorResponse;
 import jakarta.servlet.http.HttpServletRequest;
 import jakarta.servlet.http.HttpServletResponse;
+import jakarta.validation.ConstraintViolation;
+import jakarta.validation.ConstraintViolationException;
 import java.io.IOException;
 import java.io.PrintWriter;
 import java.io.StringWriter;
+import java.util.List;
 import java.util.UUID;
 import lombok.extern.slf4j.Slf4j;
 import org.springframework.http.ResponseEntity;
@@ -39,6 +42,18 @@ public ResponseEntity<ErrorMessage> handle(MethodArgumentNotValidException e) {
                 .body(errorMessage);
     }
 
+    @ExceptionHandler
+    public ResponseEntity<ErrorMessage> handle(ConstraintViolationException e) {
+        List<String> messages = e.getConstraintViolations().stream()
+                .map(ConstraintViolation::getMessage)
+                .toList();
+        ErrorMessage errorMessage = new ErrorMessage(
+                "요청값이 유효하지 않습니다: [%s]".formatted(messages.get(0)));
+        return ResponseEntity
+                .badRequest()
+                .body(errorMessage);
+    }
+
     @ExceptionHandler
     public ResponseEntity<ErrorMessage> handle(HandlerMethodValidationException e) {
         ErrorMessage errorMessage = new ErrorMessage(
diff --git a/backend/src/main/java/com/zzang/chongdae/offering/repository/entity/OfferingEntity.java b/backend/src/main/java/com/zzang/chongdae/offering/repository/entity/OfferingEntity.java
index 8be35d218..03f655c4e 100644
--- a/backend/src/main/java/com/zzang/chongdae/offering/repository/entity/OfferingEntity.java
+++ b/backend/src/main/java/com/zzang/chongdae/offering/repository/entity/OfferingEntity.java
@@ -16,6 +16,7 @@
 import jakarta.persistence.Id;
 import jakarta.persistence.ManyToOne;
 import jakarta.persistence.Table;
+import jakarta.validation.constraints.Max;
 import jakarta.validation.constraints.NotNull;
 import jakarta.validation.constraints.Positive;
 import java.time.LocalDateTime;
@@ -34,6 +35,7 @@
 public class OfferingEntity extends BaseTimeEntity {
 
     private static final int INITIAL_COUNT = 1;
+    private static final int MAX_TOTAL_COUNT = 999;
 
     @Id
     @GeneratedValue(strategy = GenerationType.IDENTITY)
@@ -68,6 +70,7 @@ public class OfferingEntity extends BaseTimeEntity {
 
     @NotNull
     @Positive
+    @Max(value = MAX_TOTAL_COUNT, message = "최대로 설정 가능한 공모 모집 인원수를 초과하였습니다.")
     private Integer totalCount;
 
     @NotNull
diff --git a/backend/src/test/java/com/zzang/chongdae/offering/integration/OfferingIntegrationTest.java b/backend/src/test/java/com/zzang/chongdae/offering/integration/OfferingIntegrationTest.java
index 3465d958a..7e7094bd1 100644
--- a/backend/src/test/java/com/zzang/chongdae/offering/integration/OfferingIntegrationTest.java
+++ b/backend/src/test/java/com/zzang/chongdae/offering/integration/OfferingIntegrationTest.java
@@ -511,7 +511,34 @@ void should_throwException_when_dividedPrice() {
             );
 
             given(spec).log().all()
-                    .filter(document("create-offering-success", resource(failSnippets)))
+                    .filter(document("create-offering-fail-with-invalid-originPrice", resource(failSnippets)))
+                    .cookies(cookieProvider.createCookies())
+                    .contentType(ContentType.JSON)
+                    .body(request)
+                    .when().post("/offerings")
+                    .then().log().all()
+                    .statusCode(400);
+        }
+
+        @DisplayName("최대로 설정 가능한 공모 모집 인원수를 초과하는 경우 예외가 발생한다.")
+        @Test
+        void should_throwException_when_overMaximumTotalCount() {
+            OfferingSaveRequest request = new OfferingSaveRequest(
+                    "공모 제목",
+                    "www.naver.com",
+                    "www.naver.com/favicon.ico",
+                    999999999,
+                    10000,
+                    2000,
+                    "서울특별시 광진구 구의강변로 3길 11",
+                    "상세주소아파트",
+                    "구의동",
+                    LocalDateTime.parse("2024-10-11T10:00:00"),
+                    "내용입니다."
+            );
+
+            given(spec).log().all()
+                    .filter(document("create-offering-fail-with-invalid-totalCount", resource(failSnippets)))
                     .cookies(cookieProvider.createCookies())
                     .contentType(ContentType.JSON)
                     .body(request)