The present invention provides a taste improving agent excellent in the effect of improving the taste of a high-intensity sweetener, or a method for improving its taste.The present invention provides a taste improving agent for high-intensity sweetener, which contains as an active ingredient an oxidized fat having a peroxide value of 15 or more and 180 or less and containing 10% by mass or more and 100% by mass or less of a milk fat. Also, the present invention provides a food or beverage that includes a high-intensity sweetener containing the taste improving agent. Also, the present invention provides a sweet taste imparting method and a sweet taste imparting composition using the oxidized fat in combination with a high intensity sweetener.本發明提供一種高甜味度甜味料的呈味之改善效果優異的呈味改善劑，或用於改善該高甜味度甜味料的呈味的方法。本發明提供一種高甜味度甜味料的呈味改善劑，其有效成分為氧化油脂，前述氧化油脂之過氧化物價在15以上180以下且含有10質量%以上100質量%以下的乳脂。又，提供一種含有高甜味度甜味料的飲食品，其係含有前述呈味改善劑。又，本發明提供將該氧化油脂與高甜味度甜味料組合而使用的甜味賦予方法以及甜味賦予用組成物。
