PURPOSE: To facilitate the mounting work of a resin-molded coil on a core by providing projections formed with resin at least at one end of upper and lower end faces of a resin mold.

CONSTITUTION: Projections 9 formed of resin are formed at one end of a resin- molded coil 18. Thus, since the coil not formed with perpendicular angle is formed with constant height from the bottom of the coil to the top of the projections 9 to become coil supports, the mounting work of the coil on a core can be facilitated without fail in the later steps.