A busbar includes a battery connecting portion and a wire connecting portion as a circuit body connecting portion. The battery connecting portion connects electrodes of two batteries to each other. The wire connecting portion is continued to the battery connecting portion, and connected directly with an electric wire so as to overlap a core wire of an electric wire thereon. The wire connecting portion includes a welding portion which the core wire of the electric wire is welded to, and a bridge portion connecting the welding portion and the battery connecting portion. A cross-sectional area of the bridge portion along an intersecting direction intersecting a direction of connecting the welding portion and the battery connecting portion is formed to be smaller than a cross-sectional area of the welding portion along the intersecting direction.