To ensure the trouble-free installation of a unit by securely coupling a draw-out bar and a coupling member together.

A roller blind device, selectively covering a car-body surface (e.g. the transparent glass cover of a roof) to be covered, has a blind web 10, the draw-out bar 11 constituted as a profile member so as to be fixed to the front end of the blind web 10 and the coupling member 12 engaged with a lateral guiding rail in order to guide the bar 11 laterally or couple the bar 11 to an electric drive unit. The bar 11 is constituted as a hollowly shaped member having an inner space 9 which allows a locking seat to accept the approximately rod-like coupling member 12 and whereinto the coupling member 12 can be introduced through an axial introduction slit 8.