PROBLEM TO BE SOLVED: To provide an oil-based lip cosmetic that is not sticky and has a prolonged smooth feeling.SOLUTION: The oil-based lip cosmetic includes a (styrene-isoprene) diblock copolymer or a hydrogenated (styrene-isoprene) diblock copolymer having an average molecular weight of 100,000 to 3,000,000.COPYRIGHT: (C)2009,JPO&INPIT【課題】糸曳きが生じず、滑らかな感触が持続する油性口唇化粧料の提供。【解決手段】平均分子量10万~300万の(スチレン-イソプレン)ジブロック共重合体又は水添(スチレン-イソプレン)ジブロック共重合体を含有する油性口唇化粧料。【選択図】なし