PROBLEM TO BE SOLVED: To provide a coffee flavor enhancer that enhances a coffee beverage flavor: and to provide a coffee beverage having an enhanced coffee flavor.SOLUTION: The coffee beverage comprises ethyl isovalerate or a plant extract containing ethyl isovalerate. The additive is the coffee flavor enhancer.COPYRIGHT: (C)2010,JPO&INPIT【課題】コーヒー飲料の風味を増強しうるコーヒー風味増強剤及びコーヒー風味が増強されたコーヒー飲料を提供すること。【解決手段】イソ吉草酸エチル又はイソ吉草酸エチルを含有する植物抽出物をコーヒー飲料に含有させる。【選択図】なし