Abstract: A common electrode line for plating is used for forming conductive patterns of a plurality of circuit substrates on a main substrate. The main substrate has a cut line for dividing one and the other circuit substrates and a plurality of through holes formed on the one and the other circuit substrates along the cut line. The common electrode lines for plating includes first common electrode lines formed on one side of the main substrate, and second common electrode lines formed on the other side of the main substrate. Each first common electrode line extends from one through hole formed on the one circuit substrate to one through hole formed on the other circuit substrate. Each second common electrode line extends from the one through hole formed on the one circuit substrate to another through hole formed on the other circuit substrate.

Abstract: A common electrode line for plating for collectively forming conductive patterns of a plurality of circuit substrates on a main substrate, and for plating the conductive patterns of the plurality of circuit substrates at the same time by the common electrode lines for plating, wherein the common electrode lines for plating 22 respectively connected to pads 14 of the plurality of circuit substrates 20A are formed on both front and back surfaces of the main substrate and connected via through holes 11, the common electrode lines for plating are wired from the circuit substrate across a cut line which divides a substrate into the plurality of circuit substrates on any of the front and back surfaces.