Abstract: First and second elastic holding members are installed symmetrically with each other on the front face of the escutcheon for receiving the front panel of the car-mounted audio system. The first and second elastic holding members have respectively first and second elastic members projected on the escutcheon. First and second holding rods are respectively formed at top parts of the elastic members. First and second engagement recesses are formed on both side faces of the front panel at corresponding positions to the first and second holding rods. By an operation for pushing the front panel onto the escutcheon, the first and second elastic members are hooked in the first and second engagement recesses while the first and second elastic members have elastic restoring forces working toward each other, and thereby the front panel is mounted onto the escutcheon.