Shading device including a shading structure displaceable between a lowered rest position and a deployed shading position in lateral guiding rails fixed to the vehicle. The shading structure is lowered through a passage into an accommodation chamber, wherein the passage is closed by a pivotably mounted lid. A control mechanism transfers the lid, in response to movement of a drive transmission, into an opened position. The control mechanism includes a control slider movably mounted transverse to the direction of displacement of the shading structure and in operative mechanical connection to the lid. The control mechanism includes a deflection device coupling the control slider, upon a movement of the drive transmission, to the drive transmission such that the control slider, upon movement of the drive transmission from the rest position of the shading structure in the direction of the shading position, transfers the closing lid to the opened position.