Vehicle door with inviolability means of the higher part of a flush glass, extension of inviolability and corresponding vehicle.

The door has a glass pane (21) flush with a frame (23) and movable with respect to the frame, and covering the frame in the closed position. The frame has a tamperproof extension (11) defining a contact surface including an inverted L-shaped section. The inverted L-shaped section supports the edge (111) and an internal border (112) of an upper part of the glass pane, when the glass pane is in the closed position. The extension receives all of the upper length of the glass. Independent claims are also included for the following: (a) an extension for a vehicle door having a sliding glass pane; and (b) a vehicle including the door.