Abstract: The present invention provides a safe antioxidant applicable for food, drug medicine, non-medical drug and other products.The antioxidant of the present invention contains, as an effective ingredient, an antioxidant substance selected from the group consisting of a hydrolysate of lactoferrin, one or more peptides isolated from a hydrolysate of lactoferrins, one or more synthetic peptides having the same sequence as that of the peptide isolated from the hydrolysate of lactoferrins, and any mixture thereof, or said antioxidant substance and oxidant preventive agent.This antioxidant has an excellent antioxidant action for various lipids, and is very safe even when used in foods and drug medicine. Scince it exhibits antioxidant effect with only small quantity, there is almost no adverse effect on flavor even when applied in foods and the like.