The sustained release pack of carbon dioxide for skin of the invention is a bag-like sustained release pack of carbon dioxide for sustainably releasing carbon dioxide sealed inside to contact skin, and is configured to be bag-like with at least a resin sheet (A). The resin sheet (A) at least satisfies the following requirements (A-1) and (A-2): (A-1) the carbon dioxide permeability measured under the conditions of 23°C and relative humidity of 0% according to JIS K7126-1 is 20 L/(m2·day·atm) or more； (A-2) the Oken-type air permeability measured at 23°C according to JIS P8117:2009 is less than 5μm/(Pa·s).本發明的皮膚用二氧化碳逐漸釋放包是用以使封入內部的二氧化碳逐漸釋放來與皮膚接觸的袋狀的二氧化碳逐漸釋放包，其至少包含樹脂片材（A）且呈袋狀，所述樹脂片材（A）至少滿足下述必要條件（A-1）及必要條件（A-2）。 （A-1）依據JIS K7126-1於23℃及相對濕度0%的條件下所測定的二氧化碳透過度為20 L/（m2·day·atm）以上 （A-2）依據JIS P8117：2009於23℃下所測定的王研式透氣度小於5 μm/（Pa·s）
