PROBLEM TO BE SOLVED: To provide functional foods containing a chestnut astringent skin extract capable of easily being drunk and consumed while preventing loss of active ingredients.SOLUTION: A manufacturing method of a chestnut astringent skin extract-containing tea leaf has a chestnut astringent skin extraction process (S11 to S14) for extracting chestnut astringent skin extract by boiling chestnut astringent skin with sarco carp, a chestnut astringent skin extract adhesion process (S15) for adhering the chestnut astringent skin extract to a surface of dried tea leaf, and an aging process (S16) for aging the tea leaf to which the chestnut astringent skin extract is adhered under low temperature of 15°C or lower for 2 or more days.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2020,JPO&INPIT【課題】有効成分の損失を防ぎつつ、容易に飲食することのできる栗渋皮エキスを含む機能性食品を提供する。 【解決手段】本発明に係る栗渋皮エキス入り茶葉の製造方法は、果肉付きの栗渋皮を煮沸して栗渋皮エキスを抽出する栗渋皮エキス抽出工程（Ｓ１１～Ｓ１４）と、栗渋皮エキスを乾燥茶葉の表面に付着させる栗渋皮エキス付着工程（Ｓ１５）と、栗渋皮エキスの付着した前記茶葉を15℃以下の低温下で2日以上熟成させる熟成工程（Ｓ１６）と、を備える。【選択図】図１
