Method for attaching a flexible sheet material to a winding shaft and roller blind

Method for fixing a flexible flat structure (3) to a tubular winding shaft (2) comprises forming a recess (20) penetrating the wall of the winding shaft on a periphery of the winding shaft, cutting the flat structure so that an angled tongue is produced and inserting the tongue into the recess of the winding shaft. The width of the recess is larger than the thickness of the flat structure. An independent claim is also included for a roller blind for a motor vehicle. Preferred Features: The flexible flat structure is adhered to the winding shaft. The recess is formed as a U- and/or V-shaped cutout.