To provide a flavor improvement agent of drink and food having flavor of powdered tea, capable of adding sweet flavor originally obtained by powdered tea, and rich feeling obtained by high class powered tea by adding small amount to powdered flavor drink and food.SOLUTION: There is provided a flavor improvement agent of food and drink obtained by powdered tea consisting of at least one kind of compound selected from alkyl pyrazines represented by the following formula (2), where Ris a methyl group or an ethyl group, and R, R, Rrepresent each independently a hydrogen atom, a methyl group or an ethyl group.SELECTED DRAWING: None【課題】抹茶風味飲食品に少量添加することにより、抹茶が本来有する甘い香味、並びに高級抹茶が有する濃厚感を付与することができる抹茶の風味を有する飲食品の香味改善剤の提供。【解決手段】下記式（２）（式中、Ｒ1はメチル基又はエチル基であり、Ｒ2、Ｒ3、Ｒ4はそれぞれ独立して水素原子、メチル基又はエチル基を示す）で表されるアルキルピラジン類から選ばれた少なくとも１種の化合物からなる、抹茶の風味を有する飲食品の香味改善剤。【選択図】なし
