To offer more manufacturing workability, better manufacturing quality and less cost.

For the structure of an ignition switch with leads, plate reference planes are provided on the midways of terminals each having a contact at one end and a lead caulked portion at the other end in the range toward both ends and the plurality of terminals are implanted in an insulating contact terminal substrate where the reference planes are aligned in one or more parallel planes for insert molding with a two-split core mold, rather than conventional integral caulking of three parts, a fixed contact, a fixed contact substrate and terminals, and soldering between the terminals and the leads.