Abstract: A sanitary device is comprised of a toilet bowl having therein an inner space and a rear portion, a casing mounted on the rear portion of the toilet bowl, an outer nozzle having at its front, intermediate and rear portions an opening, a tapered wall and an inlet, respectively, and secured to the casing in such a manner that the outer nozzle is oriented toward the inner space of the toilet bowl. A water supply device supplies an amount of water continuously to the inlet of the outer nozzle. An auxiliary valve is provided at a frontward portion of the tapered wall of the outer nozzle for interrupting the fluid communication between the atmosphere and the inside of the outer nozzle.