Disclosed is an antioxidative composition which can be produced from relatively inexpensive raw materials derived from natural products, has excellent antioxidant effect on a feed raw material, and is safe and inexpensive. Specifically disclosed is an antioxidative composition for a feed raw material, which is characterized by comprising a scum produced during the process of production of a plant oil, an oil-soluble electron donor, and a plant-derived liquid oil as a viscosity-reducing agent.