A bus bar module comprising: a plurality of bus bars each connecting electrodes of two adjacent battery cells of a plurality of battery cells constituting a battery module; and a bus bar holder 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 within a predetermined range determined by restriction of movement of the bus bar by an interference with a movement restricting member (75, 77), and having opening (79, 97) provided in either the holding portion or the coupling portion, the opening (79, 97) 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; wherein the holding portion includes a support plate that supports a portion of the bus bar except the contact portions, and a pair of side walls erecting from the support plate, extending on both sides of the bus bar, and facing each other, and the movement restricting member includes a pair of locking protrusions projecting from facing surfaces of the side walls, respectively, and the bus bar that has climbed over the pair of locking protrusions, has moved toward the support plate, and has been held by the holding portion, is movably held in an interval direction of the support plate and the locking protrusions between the support plate and the pair of locking protrusions; characterized In that the movement restricting member includes a positioning pin projecting from the support plate and loosely inserted in a guide hole in the bus bar on the support plate, and the bus bar is movably held along the support plate until the guide hole abuts against the positioning pin; wherein the locking protrusion of each side wall is configured to restrict movement of the bus bar toward a top of the side wall beyond a tip end of the positioning pin, the bus bar having climbed over the locking protrusion from the top of the side wall and moved toward the support plate. a plurality of bus bars each connecting electrodes of two adjacent battery cells of a plurality of battery cells constituting a battery module; and a bus bar holder 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 within a predetermined range determined by restriction of movement of the bus bar by an interference with a movement restricting member (75, 77), and having opening (79, 97) provided in either the holding portion or the coupling portion, the opening (79, 97) 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; wherein the holding portion includes a support plate that supports a portion of the bus bar except the contact portions, and a pair of side walls erecting from the support plate, extending on both sides of the bus bar, and facing each other, and the movement restricting member includes a pair of locking protrusions projecting from facing surfaces of the side walls, respectively, and the bus bar that has climbed over the pair of locking protrusions, has moved toward the support plate, and has been held by the holding portion, is movably held in an interval direction of the support plate and the locking protrusions between the support plate and the pair of locking protrusions; characterized In that the movement restricting member includes a positioning pin projecting from the support plate and loosely inserted in a guide hole in the bus bar on the support plate, and the bus bar is movably held along the support plate until the guide hole abuts against the positioning pin; wherein the locking protrusion of each side wall is configured to restrict movement of the bus bar toward a top of the side wall beyond a tip end of the positioning pin, the bus bar having climbed over the locking protrusion from the top of the side wall and moved toward the support plate.