Further, FIGS. 8 and 9 each are a perspective view illustrating how the output terminals 3 are attached to the second holder 4B. FIG. 9 is a perspective diagram of the second holder 4B of FIG. 8 as viewed from the other side. [0042] The first holder 4A and the second holder 4B are molded plastic products, and the output terminals 3 are obtained by press-molding a metal sheet.