The invention is to provide a pressurized gas mist bathing system, ensuring hygiene and reduction in costs, by making only one part of the system disposable. This system causes a mist to contact the skin or the mucous membrane of a living body in a high pressure not less than a predetermined value, the mist is prepared by pulverizing liquid and the mist of micron size dissolving oxygen and/or carbon dioxide gases and comprises a gas supply means 10; a gas mist generating means 30 having a fluid nozzle 32 of generating the gas mist and a liquid storage 34 of storing liquid; a pressure cover 50 for covering the skin and the mucous membrane of the living body and formed with a space for sealing inside the gas mist supplied from the gas mist generating means 30; and a humors circulating means 41 for circulating the liquid from the liquid storage 34 of the gas mist generating means 30 to the fluid nozzle 32 and wherein, in the gas mist generating means 30, at least the liquid storage 34 is displaceable and replaced by another liquid storage.