Patent ID: 7272889

Claim:
A production method of a suspension board with circuit comprising: the step of preparing a metal board, the step of forming on the metal board an insulating base layer having a base opening portion from which the metal board is exposed at a ground terminal forming portion thereof, the step of forming a thin metal film on the metal board exposed in the base opening portion and on the insulating base layer, the step of forming on the thin metal film a conductive pattern in such a manner as to cover the thin metal film exposed in the base opening portion, the step of forming on the insulating base layer an insulating cover layer covering the conductive pattern and having a cover opening portion which correspond in position to the base opening portion and from which the conductive pattern is exposed, the step of forming in the metal board a metal board opening portion from which the base opening portion and the insulating base layer around it are exposed, the step of forming an electrolytic plating layer on the conductive pattern exposed in the cover opening portion, feeding electric power from the conductive pattern, and the step of forming a metal filling layer in the metal board opening portion, to allow the electrolytic plating layer and the metal board to be conductive with each other.