To provide a cosmetic composition which is stable for a long period of time and generates carbon dioxide gas and hydrogen gas by reacting with water at use. SOLUTION: (a) one or more selected from carbonate and hydrogen carbonate, (b) solid organic acid, and (c) powdered metallic magnesium having an average particle diameter of 70 m or less Composition. Selection drawing None【課題】長期間安定であり、用時水と反応して炭酸ガス及び水素ガスを発生する化粧料組成物の提供。【解決手段】(a)炭酸塩及び炭酸水素塩から選ばれる1種又は2種以上、(b)固体状の有機酸、並びに(c)平均粒子径70μm以下の粉末状金属マグネシウムを含有する化粧料組成物。【選択図】なし