diff --git a/frontend/app/components/books/BookCardCartButton.tsx b/frontend/app/components/books/BookCardCartButton.tsx
index 058e849..77a2661 100644
--- a/frontend/app/components/books/BookCardCartButton.tsx
+++ b/frontend/app/components/books/BookCardCartButton.tsx
@@ -27,7 +27,7 @@ const BookCardCartButton = ({ book }: BookCardCartButtonProps) => {
 			leftSection={<BiSolidCartAdd size={23} />}
 			fz={{
 				base: 10,
-				sm: 'xs',
+				md: 'xs',
 			}}
 		>
 			カートに入れる