To provide a gas generation agent for applying easily and inexpensively, carbonic acid foam to a cosmetic having specific viscosity (viscosity at 25°C is 5-6500 mPa s) without using a pressure proof container, a propellant and carbonate, a kit for carbonic acid foam containing cosmetic preparation comprising the gas generation agent and the cosmetic having the specific viscosity, and a preparation method of the carbonic acid foam containing cosmetic including a step for applying such a gas generation agent to the cosmetic having specific viscosity.SOLUTION: The invention is configured so that, the gas generation agent including ice having COpercentage content of 3 mass% or more, is used as the gas generation agent for applying carbonic acid foam in use time of the cosmetic having viscosity at 25°C of 5-6500 mPa s.SELECTED DRAWING: None【課題】本発明は、耐圧容器や噴射剤、炭酸塩を必要とせずに、特定の粘度（２５℃における粘度が５～６５００ｍＰａ・ｓ）の化粧料に、簡便かつ低コストで炭酸泡を付与するための発泡剤や、該発泡剤と、特定の粘度の化粧料とを備える炭酸泡含有化粧料調製用キットや、特定の粘度の化粧料にかかる発泡剤を含有させる工程を含む、炭酸泡含有化粧料の調製方法等を提供することを目的とする。【解決手段】ＣＯ２含有率が３重量％以上の氷を含有する発泡剤を、２５℃における粘度が５～６５００ｍＰａ・ｓの化粧料の使用時に、炭酸泡を付与するための発泡剤として用いる。【選択図】なし
