A bus bar module includes a plurality of bus bars that connects a plurality of unit cells of a battery assembly constituted by the unit cells, a plurality of electric wires that are welded to surfaces of the bus bars, and an electric wire router that is made of insulating resin and includes bus bar reception portions provided side by side in an array direction of the unit cells, wherein each of the bus bar reception portions includes an opening portion that is formed to be opposed to a back surface of a corresponding one of the bus bars in accordance with a connection portion with a conductor of a corresponding one of the electric wires, and an electric wire tip holding portion that holds the vicinity of a welding portion of the conductor.