diff --git a/src/pages/operations/AdminManagementPage.tsx b/src/pages/operations/AdminManagementPage.tsx
index 6ac99bc..d3f7195 100644
--- a/src/pages/operations/AdminManagementPage.tsx
+++ b/src/pages/operations/AdminManagementPage.tsx
@@ -180,8 +180,12 @@ export function AdminManagementPage() {
 
   const submitAdmin = () => {
     if (!adminForm.email.trim() || !adminForm.name.trim() || adminForm.temporaryPassword.length < 8) return;
+    if (!/^[^\s@]+@[^\s@]+\.[^\s@]+$/.test(adminForm.email.trim())) {
+      toast({ type: 'error', title: '관리자 등록 실패', message: '올바른 이메일 주소를 입력해주세요.' });
+      return;
+    }
     setSaveState('saving');
-    createAdmin(adminForm)
+    createAdmin({ ...adminForm, email: adminForm.email.trim().toLowerCase() })
       .then(() => {
         setSaveState('idle');
         setCreateOpen(false);
@@ -448,7 +452,7 @@ export function AdminManagementPage() {
         <div className="grid gap-4">
           <label className="block">
             <span className="text-xs font-medium text-muted-foreground">이메일 <b className="text-foreground">*</b></span>
-            <input className="mt-2 h-9 w-full rounded-md border border-input bg-background px-3 text-sm text-foreground outline-none focus:ring-2 focus:ring-ring" value={adminForm.email} onChange={(event) => setAdminForm((prev) => ({ ...prev, email: event.target.value }))} />
+            <input type="email" className="mt-2 h-9 w-full rounded-md border border-input bg-background px-3 text-sm text-foreground outline-none focus:ring-2 focus:ring-ring" value={adminForm.email} onChange={(event) => setAdminForm((prev) => ({ ...prev, email: event.target.value }))} />
           </label>
           <label className="block">
             <span className="text-xs font-medium text-muted-foreground">이름 <b className="text-foreground">*</b></span>