Abstract: A convertible roof element includes a peripheral structure with an opening to be at least partially closed by a membrane, an edge rope and at least one guide rope forming a rope band tensioned against each other. The convertible roof element has a parking position and at least one shading position, the parking position running along the peripheral structure and the at least one shading position running across the opening of the peripheral structure. The edge rope is fixed at its ends via a first tensioning device to the peripheral structure. The at least one guide rope is secured to the edge rope at one end and at the other end to the peripheral structure by means of a further tensioning device. The tensile force of the further tensioning device is variable so that the edge rope is moveable from the parking position into the at least one shading position.