To provide a function-activating agent of fibroblast which is safe even when taking the agent for a long period, and can be used as food and drink.SOLUTION: There are provided a function-activating agent of fibroblast including a processed product of barley young leaves as an active ingredient, food and drink containing the function-activating agent, and a cosmetic containing the function-activating agent. Because such a function-activating agent, food and drink, and cosmetic have function-activating effect of fibroblast, effects such as anti-aging of skin, that is, reduction of resilience or elasticity of skin, prevention or improvement of aging of skin such as wrinkle and sag, restoration of scar or inflammation, furthermore prevention or improvement (treatment) of a disease or a state (symptom) caused by reduction of fibroblast function (activity) are expected.SELECTED DRAWING: None【課題】長期間服用しても安全であり、飲食品として使用できる、線維芽細胞の機能賦活用剤を提供する。【解決手段】大麦若葉の処理物を有効成分として含む線維芽細胞の機能賦活用剤、該機能賦活用剤を含んでなる飲食品、該機能賦活用剤を含んでなる化粧品。かかる機能賦活用剤や飲食品、化粧品は、線維芽細胞の機能賦活作用を有するので、皮膚の抗老化、すなわち肌の張りや弾力の低下、シワやたるみ等の肌の老化の予防又は改善、傷や炎症の修復等の効果、さらに線維芽細胞の機能（活性）低下に起因する疾患若しくは状態（症状）の予防又は改善（治療）が期待される。【選択図】なし
