PURPOSE: To make large an inductance for AC, reduce manhours and improve noise elimination efficiency by mixing a magnetic material to a insulating resin and covering a part of a single or plural lead wires.

CONSTITUTION: A magnetic powder or frake, fine pieces of ferrite magnetic powder, amorphous metal magnetic powder, iron powder and permalloy powder, etc. are added to an insulating resins such as vinyl and these are kneaded, and a part of a single or plural conductive lead wires is covered with such magnetic material. For example, the 40-part of ferrite powder is sufficiently kneaded with so-called insulating resin for covering vinyl and a conductive lead wire 1 in such a type as shown in the figure may be formed. Otherwise, 30-part of amorphous magnetic material fine piece, 20-part of ferrite powder and 50-part of organic binding material are kneaded thereby an inductance lead wire may be formed.