PROBLEM TO BE SOLVED: To provide a composition for preparation of a carbon dioxide external preparation capable of being easily prepared in a short time without soiling clothes and providing more potent effect on beauty and medical treatment in shorter time.SOLUTION: The composition for preparation of carbon dioxide external preparation is composed of: particles which contain water-soluble acid, thickener and water-soluble distribution agent as essential components in which the thickener is mixed with the water-soluble acid and water-soluble distribution agent; and a viscous composition which contains carbonate, water and a specific thickener and is mixed with the particles when used.【課題】調製が短時間で容易に行え、衣服等を汚すことがなく、より強い美容及び医療効果が短期間で得られる二酸化炭素外用剤を調製できる調製用組成物の提供。【解決手段】水溶性酸、増粘剤及び水溶性分散剤を必須成分とし、増粘剤が水溶性酸及び水溶性分散剤と混合されている粒状物と、炭酸塩、水及び特定の増粘剤を必須成分とし、使用時に粒状物と混合する粘性組成物とからなる二酸化炭素外用剤調製用組成物。【選択図】なし