Disclosed is a miniaturized carbon dioxide treatment device that does not require a carbon dioxide supply device to be connected. In a carbon dioxide treatment device, a carbon dioxide holding body made of a porous material is covered with a cover. The cover 3 includes a storage portion 3a for storing the carbon dioxide holding body 4 and an adhesive portion 3b provided around the storage portion 3a. The carbon dioxide treatment tool 1 has the carbon dioxide holding body 4 facing the affected area. It is affixed on the skin with the adhesive part 3b so that the state which exists may be maintained. The carbon dioxide holding body 4 releases carbon dioxide from the pores to the affected area, and the carbon dioxide gas is percutaneously absorbed into the affected area. [Selection] Figure 2【課題】炭酸ガス供給装置を接続する必要のない、小型化された炭酸ガス治療具を提供する。【解決手段】炭酸ガス治療具１は、多孔質材料で構成される炭酸ガス保持体４をカバー３で被覆している。カバー３は、炭酸ガス保持体４を収納する収納部３ａと収納部３ａの周辺に設けられる接着部３ｂとを備えて、炭酸ガス治療具１は、患部に炭酸ガス保持体４が対向している状態を維持するよう、接着部３ｂで皮膚に貼り付けられる。炭酸ガス保持体４は、細孔から患部に炭酸ガスを放出して、患部には炭酸ガスが経皮吸収される。【選択図】図２
