A cover for a gas mist pressure bath includes a bag shaped living-body cover member for covering the skin and mucous membrane of the living body； a tightening device disposed at one side of the living-body cover member to tighten an opening of the living-body cover member to prevent diffusion of the gas mist； a gas mist supply port communicating with an inside of the cover for the gas mist pressure bath for introducing the gas mist into the cover； an outlet attached to the living-body cover member for exhausting air, the gas mist or gas sealed in the cover for the gas mist pressure bath and controlling quantity of the air, gas mist, or gas, and a pressurizing device disposed on another side of the living-body cover member for pressurizing the inside of the living-body cover member, wherein when the pressurizing device is operating, a pressurization is applied.
