diff --git a/src/main/java/mju/iphak/maru_egg/question/dto/request/QuestionRequest.java b/src/main/java/mju/iphak/maru_egg/question/dto/request/QuestionRequest.java
index 0d1a743..fe8c2ba 100644
--- a/src/main/java/mju/iphak/maru_egg/question/dto/request/QuestionRequest.java
+++ b/src/main/java/mju/iphak/maru_egg/question/dto/request/QuestionRequest.java
@@ -3,6 +3,7 @@
 import io.swagger.v3.oas.annotations.media.Schema;
 import jakarta.validation.constraints.NotBlank;
 import jakarta.validation.constraints.NotNull;
+import jakarta.validation.constraints.Size;
 import mju.iphak.maru_egg.question.domain.QuestionCategory;
 import mju.iphak.maru_egg.question.domain.QuestionType;
 
@@ -19,6 +20,7 @@ public record QuestionRequest(
 
 	@Schema(description = "질문 내용", example = "수시 입학 요강에 대해 알려주세요.")
 	@NotBlank(message = "질문은 비어있을 수 없습니다.")
+	@Size(max = 1000, message = "크기가 0에서 1000 사이여야 합니다.")
 	String content
 ) {
 }
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diff --git a/src/test/java/mju/iphak/maru_egg/question/api/QuestionControllerTest.java b/src/test/java/mju/iphak/maru_egg/question/api/QuestionControllerTest.java
index 94f4840..3cf4ded 100644
--- a/src/test/java/mju/iphak/maru_egg/question/api/QuestionControllerTest.java
+++ b/src/test/java/mju/iphak/maru_egg/question/api/QuestionControllerTest.java
@@ -137,6 +137,20 @@ private void initializeTestData() {
 			.andExpect(jsonPath("$.data").isArray());
 	}
 
+	@Test
+	void 질문_생성_API_검증_오류_1000자_초과() throws Exception {
+		// given
+		String oversizedContent = "a".repeat(1001); // 1001자로 생성
+		QuestionRequest request = new QuestionRequest(QuestionType.SUSI, QuestionCategory.ADMISSION_GUIDELINE,
+			oversizedContent);
+
+		// when
+		ResultActions resultActions = performPostRequest("/api/questions", request);
+
+		// then
+		verifyValidationError(resultActions, "content", "크기가 0에서 1000 사이여야 합니다");
+	}
+
 	private ResultActions performPostRequest(String url, Object content) throws Exception {
 		return mvc.perform(post(url)
 				.contentType(MediaType.APPLICATION_JSON)
@@ -177,4 +191,12 @@ private void verifyQuestionListResponse(ResultActions resultActions, String expe
 			.andExpect(jsonPath("$[0].answer.content").isNotEmpty())
 			.andExpect(jsonPath("$[0].answer.renewalYear").isNotEmpty());
 	}
+
+	private void verifyValidationError(ResultActions resultActions, String field, String expectedMessage) throws
+		Exception {
+		resultActions
+			.andExpect(status().isBadRequest())
+			.andExpect(jsonPath("$.message").value(org.hamcrest.Matchers.containsString(expectedMessage)))
+			.andExpect(jsonPath("$.message").value(org.hamcrest.Matchers.containsString(field)));
+	}
 }
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