The invention is to provide a gas mist pressure bath system, which is possible to control the amount of gas and liquid, pressure and others, and cause a gas mist to be absorbed through a skin and mucous membrane of a human living body under an optimum condition. The present system comprises a gas supply means 11, a liquid supply means 21, a gas mist supply means 31 for generating and supplying the gas mist by storing the liquid inside thereof and while injecting a gas into the stored liquid, concurrently applying supersonic vibration to this liquid, and a living-body cover member 41 for covering the skin and mucous membrane of the living body and sealing inside the gas mist supplied from the gas mist supply means, and the gas mist supply means 31 comprises a supersonic vibrator 33, and a storage 32 having the gas mist generating tank 321 and a supersonic transmission tank 322, and the gas mist within the living-body cover member is caused to contact the skin and mucous membrane of the living body at pressure of not less than a predetermined value.