The present invention provides an umami enhancer which is capable of enhancing umami by being added to seasonings, extracts, foods or the like, and a method of enhancing umami.The umami enhancer contains an oxidized fat and oil having a peroxide value of 12 to 180 and containing 10% by mass or more and 100% by mass or less of milk fat as an active ingredient. Also, a seasoning, an extract, and a food which umami is enhanced by the addition of the umami enhancer. Furthermore, a method of the present invention enhances the umami of seasoning, extract, and food by adding an oxidized fat and oil having a peroxide value of 12 to 180 and containing 10% by mass or more and 100% by mass or less of milk fat.本發明提供一種藉由於調味料、萃取物、食品等進行添加而可增強鮮味的鮮味增強劑，以及增強鮮味的方法。本發明之鮮味增強劑係以過氧化物價為12至180且包含10質量%以上100質量%以下的乳脂之氧化油脂作為有效成分者。又，本發明是經由該鮮味增強劑的添加而增強鮮味的調味料、萃取物及食品。再者，本發明係藉由添加包含過氧化物價為12至180且包含10質量%以上100質量%以下的乳脂之氧化油脂而增強調味料、萃取物、及食品之鮮味的方法。
