Provided are a gas mist pressure bathing method and a gas mist pressure bathing system that improve the efficiency of absorbing a gas mist from the skin and mucous membranes of a living body. The gas mist pressure bathing method is provided with a first step, a second step and a third step. The first step involves supplying a gas mist and gas for a predetermined time to at least a first cover 51 of a living body cover member 50 having said first cover 51 and a second cover 55 positioned outside of the first cover 51, the inside of said second cover 55 being substantially sealed; covering the skin and mucous membranes of the living body; and forming a space wherein the gas mist and gas supplied by a gas mist generating means 30 are sealed. The second step involves discharging the gas mist and gas from the first cover 51 and/or the second cover 55. The third step involves supplying the gas mist and gas for a predetermined time from the gas mist generating means 30 to the first cover 51 and the second cover 55, and keeping the pressure inside at least the second cover 55 in a predetermined range. The first to third steps are repeated multiple times.