The present invention is to provide a gas mist mask device which is compact and economical, and enables to take a mist bath for the face or the eyes by using the physiological actions of oxygen or carbon dioxide. The gas mist mask device comprises a gas supply means 110 of supplying carbon or carbon dioxide, otherwise the mixed gas (called briefly as “gas” hereafter) of oxygen and carbon dioxide, a gas mist generating means 120 connected to the gas supply means for storing a liquid inside thereof and generating a mist (called as “gas mist” hereafter) prepared by pulverizing and dissolving the stored liquid and the gas, and a mask member having a mask main frame 131 with a first sheet passing the gas mist and a second sheet not passing, and holding parts 138 of securing the mask main frame 131 in such a manner that the first sheet is fronted to the eyes or the face of the human living organism, and this gas mist generating means supplies the gas mist between the first sheet and the second sheet, thereby contacting the gas mist to the eyes or the face of the human living organism.