PROBLEM TO BE SOLVED: To provide an organopolysiloxane which can suppress inflation of a container caused by hydrogen gas derived from a Si-H group over time and generation of a nasty smell derived from an aliphatic unsaturated group, is excellent in emulsification stability, and is capable of giving cosmetics with its cosmetic effect kept for a long time.SOLUTION: The invention provides an organopolysiloxane represented by the average formula (1) where Ris each independently a C1-C30 alkyl group, a C6-C30 aryl group, and the like； Ris a C2-15 bivalent organic group； Ris H or C1-30 alkyl group； and Ris each independently a C2-30 alkyl group or a trialkylsilyl-ended linear siloxane.SELECTED DRAWING: None【課題】経時でＳｉ－Ｈ基由来の水素ガスによる容器の膨れや脂肪族不飽和基由来の異臭の発生を抑制でき、乳化安定性に優れ、化粧持続性の良好な化粧料を与えることができるオルガノポリシロキサン及びそれを含む化粧料の提供。【解決手段】平均式（１）で示されるオルガノポリシロキサン。［Ｒ１は各々独立にＣ１～３０のアルキル、Ｃ６－３０のアリール等；Ｒ２はＣ２～１５の２価有機基；Ｒ３はＨ又はＣ１～３０のアルキル基；Ｒ４は各々独立にＣ２～３０のアルキル基又はトリアルキルシリル末端直鎖シロキサン］【選択図】なし
