Roller blind device for a motor vehicle

The roller blind assembly (10) has a rigid guide tube (90a,90b) for guiding a power train from a frame (30,30a,30b) to a guide rail (70) or extending the power train to a stationary guide rail at a supply section (80). A setting unit is provided for determining a frame-side end of the guide tube present in the variable positions in a transverse direction (2). A flexible sheet (62) is coiled up on a winding shaft (60) in a storage position and is uncoiled on the winding shaft to achieve a functional position in a longitudinal direction (4).