To provide a circuit material forming method that is excellent in workability without need to separately apply resist processing to a bus-bar while forming a high-current circuit part with the bus-bar separately from a copper-foil pattern of a printed circuit board.
A circuit material is stored in an on-vehicle electrical junction box. The bus-bar, in which an insulating sheet made of a prepreg material is stuck onto at least the face opposite to the printed circuit board, is fixed on the surface of the printed circuit board having a copper-foil pattern via an adhesive sheet. A high-current circuit is formed of the bus-bar. Circuits other than the high-current circuit are formed of the copper-foil pattern. At least a part of the bus-bar is fixed at a lamination position on a part where at least a part of the copper-foil pattern is exposed while interposing the adhesive sheet. Each terminal pin is inserted into the lamination position. Each terminal pin is connected to the bus-bar and the copper-foil pattern by soldering.
SAKA YUJI
ONIZUKA TAKAHIRO
