A shading device for a vehicle roof includes at least one shading length that can be rolled up for shading a light-permeable and/or open area of the vehicle roof, a tension bow that is movably mounted in a direction of travel (V), to which the shading length-is fastened, a drive mechanism that can be operated by a drive motor to move the tension and a control unit for activating the drive motor. The shading device includes at least one opposing force element for restricting a traveling movement of the tension bow, and the control unit is designed to activate the drive motor based on an opposing force when the tension bow reaches an end position (P1, P2) defined by the stop element.