PROBLEM TO BE SOLVED: To provide a novel food or drink flavor improving agent.SOLUTION: Used is a flavor improving agent that comprises a heat reaction product obtained by making a sulfur-containing D-amino acid or sulfur-containing D-amino acid residue-containing peptide or a salt thereof and a carbonyl compound coexist and heating them.COPYRIGHT: (C)2016,JPO&INPIT【課題】 新規な飲食品の風味改良剤の提供。【解決手段】含硫D-アミノ酸もしくは含硫D-アミノ酸残基含有ペプチドまたはそれらの塩と、カルボニル化合物とを共存させ、加熱してなる加熱反応物を含む、風味改良剤を用いる。【選択図】なし