PROBLEM TO BE SOLVED: To provide: a fruit flavor enhancer that enhances the fruit freshness feeling and fruit fruit-juice feeling； a perfume composition that contains said enhancer as an active ingredient； and a food and beverage product using the same in which the fruit flavor, especially the fruit freshness feeling and fruit juice feeling, is enhanced.SOLUTION: Provided are: a fruit flavor enhancer containing, as an active ingredient, rotundone (3S,5R,8S)-3,8-dimethyl-5-(prop-1-en-2-yl)-3,4,5,6,7,8-hexahydroazulen-1(2H)-one) which is known as a constituent of agarwood； a fruit perfume composition or a food and beverage product containing a fruit flavor enhancer by 0.5 ppt to 0.5 ppm as rotundone； a method for enhancing the fresh fruit-feeling of a fruit perfume composition by adding rotundone by 0.5 ppt to 0.5 ppm to the fruit perfume composition； and a method for enhancing the fruit flavor of a food and beverage product by adding rotundone by 0.005 ppt to 5 ppt to the food and beverage product.SELECTED DRAWING: None【課題】果実のフレッシュ感、果実の果汁感を増強する果実香味増強剤及び該増強剤を有効成分として含有する香料組成物、並びにそれを用いた果実の香味、特に、果実のフレッシュ感、果汁感が増強された飲食品の提供。【解決手段】沈香の成分として知られているロタンドン（３Ｓ，５Ｒ，８Ｓ）－３，８－ｄｉｍｅｔｈｙｌ－５－（ｐｒｏｐ－１－ｅｎ－２－ｙｌ）－３，４，５，６，７，８－ｈｅｘａｈｙｄｒｏａｚｕｌｅｎ－１（２Ｈ）－ｏｎｅ）を有効成分とする果実香味増強剤。果実香味増強剤をロタンドンとして０．５ｐｐｔ～０．５ｐｐｍ含有する果実香料組成物及び飲食品。ロタンドンを果実香料組成物に対して０．５ｐｐｔ～０．５ｐｐｍ含有させる、果実香料組成物のフレッシュな果実感増強方法。ロタンドンを飲食品に対して０．００５ｐｐｔ～５ｐｐｔ含有させる、飲食品の果実香味増強方法。【選択図】なし
