Abstract: A vehicle door of the type comprising a window opening defined by a frame having a pair of posts and a cross-member, and a window glass for closing the window opening selectively movable between the window opening and an underlying accessory opening provided within the door; the frame presents an outer front surface provided with a channel-shaped cavity, and the window glass is mounted slidably in a perimeter strip rigid with a supporting element the shape of which mates with that of the channel-shaped cavity of the frame; the glass, the strip and the supporting element constituting a preassembled self-supporting unit which is fastened to the window frame by snap-hooking means housed within the channel-shaped cavity.