A lighting device 12 of the present invention includes a light source 17, an external power source 21 arranged to supply drive power to the light source 17, and a relay connector 19 arranged to provide an electrical connection between the light source 17 and the external power source 21. The relay connector 19 includes a conductive resin layer 40 and an insulating resin layer 50 arranged on the periphery of the conductive resin layer 40. According to the construction, the conductive portion and the insulating portion of the relay connector 19 are both made of resin, and therefore can be formed by the same process, e.g., by two-shot molding. Further, the number of components can be reduced.