To provi de a flavor enhancer having, in a good balance, a raw milk feeling which gives a flavor of a fresh milk, a rich feeling of the raw milk, a natural feeling, and a preference property.That is the flavor enhancer for food and drink, which comprises, as an effective component, a treated product which is obtained by subjecting a total milk protein to a lactic acid fermentation treatment and protease treatment.本發明提供均衡地具有新鮮乳香味即鮮乳感、鮮乳之濃厚感、自然感、可口性的香味賦予物。本發明係飲食品之香味賦予物,其含有對全乳蛋白進行乳酸醱酵處理以及蛋白酶處理所得之處理物作為有效成分。