A bus bar module includes a plurality of bus bars and a bus bar holder. The bus bar holder is constituted by coupling a plurality of holding portions in a chain manner via deformable coupling portions, respectively, the plurality of holding portions each holding the bus bar in a movable manner in predetermined ranges determined by restriction of movement of the bus bar by interferences with movement restricting members. Openings allowing two contact portions of the bus bar held by the holding portion to be exposed to an outside, the two contact portions being respectively connected to the electrodes of the two adjacent battery cells, are provided in either the holding portion or the coupling portion.