Motor vehicle door with integrated roller blind, roller blind, decoration covering and corresponding vehicle

The automobile door comprises an external bodywork panel and an interior trimming panel (34). A reinforcing element (31) extending inside the door lower part has a section for receiving a blind (32) for selectively masking a window installed in the door upper part. The reinforcing section comprises a rigidifying portion (313,3121) against which the lower trimming panel is supported. Independent claims are included for a reinforcing section, a blind, molding for blind passage slot and vehicle having such a door.