To provide an antioxidant that improves the utilization regime of basidiomycete limited to mushroom production by utilizing a white-rot fungus/Gramineae plant culture-based extract, uses excellent antioxidative property and radical eliminability of white-rot fungus/Gramineae plant culture-based extract being a natural component while increasing utilization efficiency of natural resource, is efficient and has excellent effects; and a cosmetic composition.

The radical-eliminating antioxidant comprises a white-rot fungus/Gramineae plant culture-based extract.