Mounting device for securing a seat belt buckle to a seat frame of a vehicle seat has a fitting which is connectable to the seat belt buckle via a connecting element, and a mounting element which is connected to the seat frame. The fitting is supported on the mounting element in a rotatably articulated manner. A spring element having a locking element is provided which is fastened to the mounting device in a rotation-free manner. By rotating the fitting on the mounting element from a mounting position into a use position, a cutout in the fitting overlaps with a cutout in the mounting element, and the locking element locks with both cutouts at the same time, thus fixing the fitting, prevented from rotating, on the mounting element.