BUS BAR MODULE

A bus bar includes a plurality of fastening holes in which a plurality of electrodes of a single cell is fastened with a nut, and a plurality of projections formed between the fastening holes and projecting in a direction away from the single cell. A case includes a bus bar hosing portion in which the bus bar is housed, and a support portion disposed in the projection of the bus bar housed in the bus bar housing portion and abutting against a back surface of the projection to support the bus bar. The support portion includes a base portion protruding in an arrangement direction of the fastening holes. At least a part of both side surfaces of the base portion overlaps with an inner side surface of the projection as viewed from a direction perpendicular to a fastening direction in which the bus bar is fastened to the electrode.