diff --git a/packages/bezier-react/src/components/AlphaSpinner/Spinner.tsx b/packages/bezier-react/src/components/AlphaSpinner/Spinner.tsx
index 77f3d8913e..1aaa6c1c82 100644
--- a/packages/bezier-react/src/components/AlphaSpinner/Spinner.tsx
+++ b/packages/bezier-react/src/components/AlphaSpinner/Spinner.tsx
@@ -10,14 +10,14 @@ export const SPINNER_TEST_ID = 'bezier-spinner'
 
 export const Spinner = forwardRef<HTMLSpanElement, SpinnerProps>(
   function Spinner(
-    { className, size = 'm', variant = 'secondary', ...rest },
+    { className, size, variant = 'secondary', ...rest },
     forwardedRef
   ) {
     return (
       <span
         className={classNames(
           styles.Spinner,
-          styles[`size-${size}`],
+          size && styles[`size-${size}`],
           styles[`variant-${variant}`]
         )}
         ref={forwardedRef}
diff --git a/packages/bezier-react/src/components/AlphaSpinner/Spinner.types.ts b/packages/bezier-react/src/components/AlphaSpinner/Spinner.types.ts
index e82251598f..368364e3f4 100644
--- a/packages/bezier-react/src/components/AlphaSpinner/Spinner.types.ts
+++ b/packages/bezier-react/src/components/AlphaSpinner/Spinner.types.ts
@@ -9,6 +9,7 @@ type SpinnerSize = 's' | 'm'
 interface SpinnerOwnProps {
   /**
    * The style variant of Spinner.
+   * @default 'secondary'
    */
   variant?: 'primary' | 'secondary' | 'on-overlay'
 }