PURPOSE: To improve assembling precision of contacts to a body main body, eliminate danger of short-circuiting, and save labor in assembling the contacts to contribute to reduction of cost.

CONSTITUTION: Plural contact sets 63 each comprising plural sorts of contacts 3, 4, 5 as a set are integrally moulded through connection parts 55, 56, 58, 61, each contact set 63 is inserted into a die for moulding each body main body 2 in a moulder provided with plural units of dies for moulding body main bodies 2, resin for the body main body 2 is injected into the dies for moulding the body main bodies 2, and after a lamp body continuous body 65 in which plural lamp bodies 1 each comprising the body main body 2 of resin and the contact set 63 integrated with each other are continuously provided is formed, the connection parts 55, 56, 58, 61 are cut off to manufacture plural lamp bodies for vanity mirrors.