Abstract: The invention relates to a mounting device for fastening a toilet seat set to a toilet bowl in a reversibly releasable manner, comprising a connecting segment which can be connected to the toilet seat set in a stationary manner, and a rod segment, which is arranged on the connecting segment and which can be fed at least partially through a mounting opening of the toilet bowl. Furthermore, the mounting device has a deformable blocking part, which is fastened to the rod segment (12) at a distance from the connecting segment, wherein the connecting segment and the blocking part can be arranged on opposite sides of the mounting opening when the rod segment is at least partially fed through the mounting opening of the toilet bowl.