PROBLEM TO BE SOLVED: To provide a new flavor improving agent which can reinforce unconventional natural feeling and fresh feeling by added in a perfume composition having various scents.SOLUTION: There are provided a flavor improving agent which can reinforce unconventional natural feeling and fresh feeling by added in a perfume composition having various scents, and contains 2-methyl-3-butene-2-thiol as an active ingredient; a perfume composition containing the flavor improving agent; and consumer goods such as food and drink and perfumery in which unconventional natural feeling and fresh feeling are reinforced by containing the flavor improving agent or perfume composition.SELECTED DRAWING: None【課題】様々な香気の香料組成物に添加することで従来にない天然感やフレッシュ感を増強できる、新規な香味改善剤を提供すること。【解決手段】種々の香料組成物に添加することで従来にない天然感やフレッシュ感を増強できる、2-メチル-3-ブテン-2-チオールを有効成分とする香味改善剤、該香味改善剤を含有する香料組成物、および該香味改善剤または香料組成物を含有することで従来にない天然感やフレッシュ感が増強された飲食品、香粧品などの消費財を提供する。【選択図】なし