A mounting device for positioning and securing a sanitary appliance, in particular a toilet bowl, said device comprising at least two or exactly two mutually spaced vertical struts, wherein the vertical struts are connected to one another by at least one or exactly one single hollow body and wherein the hollow body comprises at least one securing element, by means of which the sanitary appliance can be secured to the mounting device, wherein, in respect of the at least one securing element, the hollow body extends downward in the installed position, wherein the hollow body is made of metal and is connected materially, in particular by means of a welded joint, wherein the front surface of the vertical struts defines a front plane and the rear surface of the vertical struts defines a rear plane, wherein the hollow body lies between said two planes or is congruent with said planes, wherein the hollow body has a front wall and a rear wall arranged at a distance from the front wall, which front wall and rear wall are connected by means of their lateral edges (13, 14) facing the vertical strut to the respective vertical strut, wherein the front wall and the rear wall are connected by at least one reinforcing profile and/or at least one reinforcing rib, wherein the hollow body comprises an aperture, which provides a free interspace through the hollow body, through which a drainage pipe can be passed, wherein the aperture is V-shaped or trapezoidal and, in the installed position, extends into the hollow body from below, wherein the aperture is arranged in such a way that the hollow body has a web region above the aperture and wherein the reinforcing profile and/or the reinforcing rib extend along the free lateral edges (17, 18) of the frontwall and the rear wall, which are not connected to the vertical strut. at least two or exactly two mutually spaced vertical struts, wherein the vertical struts are connected to one another by at least one or exactly one single hollow body and wherein the hollow body comprises at least one securing element, by means of which the sanitary appliance can be secured to the mounting device, wherein, in respect of the at least one securing element, the hollow body extends downward in the installed position, wherein the hollow body is made of metal and is connected materially, in particular by means of a welded joint, wherein the front surface of the vertical struts defines a front plane and the rear surface of the vertical struts defines a rear plane, wherein the hollow body lies between said two planes or is congruent with said planes, wherein the hollow body has a front wall and a rear wall arranged at a distance from the front wall, which front wall and rear wall are connected by means of their lateral edges (13, 14) facing the vertical strut to the respective vertical strut, wherein the front wall and the rear wall are connected by at least one reinforcing profile and/or at least one reinforcing rib, wherein the hollow body comprises an aperture, which provides a free interspace through the hollow body, through which a drainage pipe can be passed, wherein the aperture is V-shaped or trapezoidal and, in the installed position, extends into the hollow body from below, wherein the aperture is arranged in such a way that the hollow body has a web region above the aperture and wherein the reinforcing profile and/or the reinforcing rib extend along the free lateral edges (17, 18) of the frontwall and the rear wall, which are not connected to the vertical strut.