The invention is to provide a gas mist pressure bath device which enables to cause efficiently absorb a gas mist into a skin or mucous membrane of a living-body, and attains to be compact and to lower cost. The device 10 is to cause oxygen, carbon dioxide, or a mixed gas (called as "gas" hereafter) of oxygen and carbon dioxide at a density of not less than a predetermined value to contact the skin or mucous membrane of the living-body, and the device comprises a gas mist generating means 11 for generating and supplying a mist (called as "gas mist" hereafter) prepared by pulverizing and dissolving the gas and liquid, and a substantially bag shaped living-body cover member 21 for covering the living-body s skin or mucous membrane and sealing inside, and the gas mist is supplied into the living-body cover member in order to heighten internal pressure therein so that the gas mist is caused to contact the living-bodys skin or mucous membrane at a pressure more than the predetermined value.
