The present invention relates to an antioxidant composition for the skin. More specifically, it relates to an antioxidant composition for the skin having: Saccharomyces ferment; and α-ketoglutaric acid or niacinamide alone or a mixture thereof. The antioxidant composition for the skin according to the present invention has not only an excellent antioxidant effect but also a high long lasting effect. Therefore, it provides an enhanced antioxidant effect when applied to the skin and it enables manufacture of various products such as cosmetics and medicines because it is not harmful to the human body.