diff --git a/core/src/main/kotlin/common/exception/ErrorType.kt b/core/src/main/kotlin/common/exception/ErrorType.kt
index c781b425..0a15637f 100644
--- a/core/src/main/kotlin/common/exception/ErrorType.kt
+++ b/core/src/main/kotlin/common/exception/ErrorType.kt
@@ -71,6 +71,7 @@ enum class ErrorType(
         "현재 일시 중단된 기능입니다. 자세한 내용은 알림을 참고해 주세요.",
         "현재 일시 중단된 기능입니다. 자세한 내용은 알림을 참고해 주세요.",
     ),
+    DIARY_QUESTION_INVALID(HttpStatus.BAD_REQUEST, 40026, "강의 일기장 질문이 유효하지 않습니다", "강의 일기장 질문이 유효하지 않습니다"),
 
     SOCIAL_CONNECT_FAIL(HttpStatus.UNAUTHORIZED, 40100, "소셜 로그인에 실패했습니다", "소셜 로그인에 실패했습니다"),
     INVALID_APPLE_LOGIN_TOKEN(HttpStatus.UNAUTHORIZED, 40101, "유효하지 않은 애플 로그인 토큰입니다", "소셜 로그인에 실패했습니다"),
diff --git a/core/src/main/kotlin/common/exception/SnuttException.kt b/core/src/main/kotlin/common/exception/SnuttException.kt
index 6a8cf9c5..e4cc8259 100644
--- a/core/src/main/kotlin/common/exception/SnuttException.kt
+++ b/core/src/main/kotlin/common/exception/SnuttException.kt
@@ -135,6 +135,8 @@ object SocialProviderNotAttachedException : SnuttException(ErrorType.SOCIAL_PROV
 
 object DiaryQuestionNotFoundException : SnuttException(ErrorType.DIARY_QUESTION_NOT_FOUND)
 
+object DiaryQuestionInvalidException : SnuttException(ErrorType.DIARY_QUESTION_INVALID)
+
 object DiaryDailyClassTypeNotFoundException : SnuttException(ErrorType.DIARY_DAILY_CLASS_TYPE_NOT_FOUND)
 
 object DiarySubmissionNotFoundException : SnuttException(ErrorType.DIARY_SUBMISSION_NOT_FOUND)
diff --git a/core/src/main/kotlin/diary/service/DiaryService.kt b/core/src/main/kotlin/diary/service/DiaryService.kt
index 2c3892cd..72e0f131 100644
--- a/core/src/main/kotlin/diary/service/DiaryService.kt
+++ b/core/src/main/kotlin/diary/service/DiaryService.kt
@@ -2,6 +2,7 @@ package com.wafflestudio.snutt.diary.service
 
 import com.wafflestudio.snutt.common.enums.Semester
 import com.wafflestudio.snutt.common.exception.DiaryDailyClassTypeNotFoundException
+import com.wafflestudio.snutt.common.exception.DiaryQuestionInvalidException
 import com.wafflestudio.snutt.common.exception.DiaryQuestionNotFoundException
 import com.wafflestudio.snutt.common.exception.DiarySubmissionNotFoundException
 import com.wafflestudio.snutt.common.exception.LectureNotFoundException
@@ -206,6 +207,9 @@ class DiaryServiceImpl(
         if (targetDailyClassTypeIds.size != request.targetDailyClassTypes.size) {
             throw DiaryDailyClassTypeNotFoundException
         }
+        if (request.answers.size != request.shortAnswers.size) {
+            throw DiaryQuestionInvalidException
+        }
         val question =
             DiaryQuestion(
                 answers = request.answers,