diff --git a/src/constants/helperText.ts b/src/constants/helperText.ts
index 21831a12..1d666ca9 100644
--- a/src/constants/helperText.ts
+++ b/src/constants/helperText.ts
@@ -2,6 +2,7 @@ export const COMMON = {
   success: {},
   error: {
     required: '필수 정보입니다.',
+    requiredLogin: '로그인이 필요합니다.',
     onlyNumber: '숫자만 입력 가능합니다.',
     onlyHttps: 'https:// 로 시작해야 합니다.',
     minLength: (min: number) => `${min}글자 이상 입력해주세요.` as const,
diff --git a/src/pages/Study/Modal/StudyModal.tsx b/src/pages/Study/Modal/StudyModal.tsx
index 299dd5af..d15f1224 100644
--- a/src/pages/Study/Modal/StudyModal.tsx
+++ b/src/pages/Study/Modal/StudyModal.tsx
@@ -1,5 +1,6 @@
 import React, { useEffect, useState } from 'react';
 import { Controller, useForm } from 'react-hook-form';
+import toast from 'react-hot-toast';
 import { useQueryClient } from 'react-query';
 import { InputLabel, Stack, Typography, useMediaQuery, useTheme } from '@mui/material';
 import { SiNotion } from 'react-icons/si';
@@ -146,6 +147,9 @@ const StudyModal = ({ open, setOpen, selectedStudyInfo, setSelectedStudyInfo, cu
           group: member.generation,
         })) || []),
       ]);
+    } else if (open && !headMemberInfo) {
+      toast.error(COMMON.error.requiredLogin);
+      setOpen(false);
     }
   }, [open, headMemberInfo]);