An active oxygen eliminator derived from a natural substance, which comprises water, an organic solvent and an emulsifier and also comprises, as essential active components, p-coumarinic acid, 3,4-di-O-caffeoylquinic acid, 3,5-di-O-caffeoylquinic acid, 4-hydroxy-3-prenylcinnamic acid and 3,5,7-trihydroxy-4'-methoxyflavonol, a food comprising the active oxygen eliminator and a cosmetic comprising the active oxygen eliminator.