Patent ID: 8460563

Claim:
A producing method of a wired circuit board, the producing method comprising: a laminating step of preparing a metal supporting board, forming an insulating base layer on the metal supporting board, forming a conductive layer including a terminal portion and a plating lead continued from the terminal portion on the insulating base layer, and forming an insulating cover layer on the insulating base layer so as to cover the conductive layer; a first etching step of at least one of: a) etching the metal supporting board, and then etching the insulating base layer to simultaneously expose the lower surface of the plating lead and the lower surface of the terminal portion from the metal supporting board and the insulating base layer, or b) etching the metal supporting board, and then etching the insulating base layer to expose the lower surface of the plating lead from the metal supporting board and the insulating base layer simultaneously with a step of forming of a tooling hole in the metal supporting board; a second etching step of etching the exposed plating lead thereby removing the exposed plating lead; and a step of trimming the metal supporting board simultaneously with the second etching step.