Roller blind for vehicle, adapted to non-rectangular windows

The blind for a non-rectangular bay (12) comprises a pulling bar (14) mounted at the free end of a canvas (13) able to run in a bottom slit between folded and unfolded positions. The bar engages an end element (15) able to take up a position covering the slit and a position of reduced size when it is folded relative to the bar so that the assembly has a length less than that when it is in the slit covering position.