Badge-plate and counterplate unit to safely apply emblems and the like on the front wall of the housing for air bag devices, in cars and other motorvehicles, and particularly onto the portion of said wall opening up, at the centre of the steering wheel, when the air bag device starts to operate, said unit consisting of a badge-plate, formed by coining from a metal sheet in one piece with at least a central projecting extruded pin having a conical cavity at its end, and of a counterplate comprising at least a hole in correspondence of said pin, the counterplate being steadily associated to the badge-plate--after having interposed between them the wall housing the air bag device--by riveting with a caulking the end of said pin of the badge-plate onto the edge of said hole of the counterplate, characterized in that the badge-plate (1) is formed by the combination of a metal ring (4), provided with at least two of said projecting extruded pins (6), with a disk (5) carrying the emblem (3) and the periphery of which is shaped so as to be steadily coupled with said ring (4), the counterplate having holes in correspondence of said pins (6).