The foot tray (18) has a plate-like foot tray main portion is supported on the bottom portion (5) of the passenger compartment (2). The height adjustable inflatable airbag is arranged on a floor covering (7). The plate-like foot tray main portion is covered by a pliable floor mat (19). The pliable floor mat is larger than the plate-like foot tray main portion, when the foot tray main portion is in use position. The edge sections (25-28) of the floor mat are placed on the passenger compartment floor covering over which is main portion rested.
