A cover for an air bag device that enables an emblem to be secured to the cover in an extremely simple manner. The cover (module cover) has a recess for receiving the emblem. An extension of the emblem is extended through a hole in the cover. A distal end of the extension is bent along a rear side of the cover. A rib is pressed and welded by a thermal or ultrasonic welding element to form a welding body. The welding body covers the distal end of the extension.