To prevent radiation of noise to a glass antenna from a bulb or a harness of a high mount stop lamp.

A high mount stop lamp 10 is installed on a parcel board 20 in the neighborhood of a rear glass window of an automobile on which a glass antenna is installed, and it is furnished with a bulb 12, a lens 14 arranged backward in the longitudinal direction of the automobile against the bulb 12, a reflector 16 surrounding the bulb 12 with the lens 14 and having a reflecting surface 16a inside and a cover 18 to store the bulb 12 and the reflector 16. At least the reflecting surface 16a of the reflector 16 is formed of a conductive member, a terminal 19a of a wiring 19 is connected to a conductive surface 16c of a flange part 16b of the reflector 16 connected to the reflecting surface 16a, and the other end 19b of the wiring 19 is connected to a minus wire 13a of a harness 13.