Patent ID: 8236186

Claim:
A production method of a suspension board with circuit, the production method comprising the steps of: forming, on a metal supporting board, an insulating layer formed with a first opening in correspondence to the suspension board with circuit; forming a metal thin film on the insulating layer and on the metal supporting board exposed from the first opening; forming, on a surface of the metal thin film, a conductive layer having a plurality of signal wires and terminal portions connected to the individual signal wires in correspondence to the suspension board with circuit; forming, on the terminal portions, a metal plating layer by electrolytic plating using the metal supporting board as a lead in correspondence to the suspension board with circuit; forming a second opening in a portion of the metal supporting board opposing the first opening such that the second opening surrounds the first opening, and is kept from contact with a peripheral edge of the first opening; and partially etching the metal supporting board correspondingly to an outer shape of the suspension board with circuit to form a metal supporting layer, and thus form the suspension board with circuit and a surrounding supporting frame which surrounds the suspension board with circuit and supports the suspension board with circuit, wherein, in the step of forming the insulating layer, the first opening is formed in the insulating layer at a position where the surrounding supporting frame is formed and which defines an area which is larger relative to an area of the suspension board with circuit where the terminal portions are formed, wherein the surrounding supporting frame is formed in a generally rectangular frame shape when viewed in a plan view.