A plastic covenng 32 of an electnc wire 30 is removed, exposing a core wire 31, this core wire 31 being attached to core wire receiving members 13 of a lamp body 10. Attaching a bulb socket 20 to the lamp body 10 causes the core wire to be resiliently held between contact members 24D of the bulb socket 20 and the core wire receiving members 13. thereby connecting the bulb socket 20 and the electric wire 30. The core wire 31 makes direct contact with the contact members 24D, and therefore connecting terminals are not required between the bulb socket 20 and the electric wire 30. the number of components is thus decreased.