FIGS. 5A to 5C are diagrams for explaining the construction of the second connecting portion 2, where FIG. 5A is a side view, FIG. 5B is a plan view, and FIG. 5C is a cross-sectional view taken along a line V???V shown in FIG. 5B. The second connecting portion 2 has a plurality of male terminals 20 which are respectively engaged with a plurality of terminals arranged in a connecting portion 112 (s