A bus bar module comprising: a bus bar configured to electrically connect electrode terminals respectively included in a plurality of battery cells; and a detection conductor configured to be electrically connected to the bus bar, wherein the bus bar includes a pair of electrode joining parts respectively joined to the different electrode terminals, a coupling part configured to couple the pair of electrode joining parts to each other, and to be able to be cut between the pair of electrode joining parts in a state in which the pair of electrode joining parts is respectively joined to the electrode terminals, and a pair of rejoinable parts are portions respectively extending from the pair of electrode joining parts along a width direction, wherein the pair of electrode joining parts, the coupling part and the pair of rejoinable parts are integrally formed of metallic material having electrical conductivity, wherein the bus bar is formed in a U-shaped plate shape as a whole by the pair of electrode joining parts, the coupling part, and the pair of rejoinable parts, wherein the coupling part includes a connection tab part and a notch part, wherein the connection tab part is a portion to which the detection conductor is electrically connected and which is formed to project from a center portion in an arrangement direction of the coupling part toward one side along the width direction to have a plate shape, and the notch part is formed as a part notched in a recessed shape along the width direction, wherein the notch parts are respectively disposed on both sides in the arrangement direction of the connection tab part in the coupling part, wherein the notch parts are disposed, as a pair, on both sides of the coupling part to be opposed to each other in the width direction, so that the pair of the notch parts opposed to each other in the width direction is assumed to be one group, and two groups of the notch parts are respectively disposed on both sides in the arrangement direction of the connection tab part, and the pair of electrode joining parts and the coupling part constitute a conductive connection part that is disposed across the different electrode terminals to electrically connect the different electrode terminals to each other. a bus bar configured to electrically connect electrode terminals respectively included in a plurality of battery cells; and a detection conductor configured to be electrically connected to the bus bar, wherein the bus bar includes a pair of electrode joining parts respectively joined to the different electrode terminals, a coupling part configured to couple the pair of electrode joining parts to each other, and to be able to be cut between the pair of electrode joining parts in a state in which the pair of electrode joining parts is respectively joined to the electrode terminals, and a pair of rejoinable parts are portions respectively extending from the pair of electrode joining parts along a width direction, wherein a pair of electrode joining parts respectively joined to the different electrode terminals, a coupling part configured to couple the pair of electrode joining parts to each other, and to be able to be cut between the pair of electrode joining parts in a state in which the pair of electrode joining parts is respectively joined to the electrode terminals, and a pair of rejoinable parts are portions respectively extending from the pair of electrode joining parts along a width direction, wherein the pair of electrode joining parts, the coupling part and the pair of rejoinable parts are integrally formed of metallic material having electrical conductivity, wherein the bus bar is formed in a U-shaped plate shape as a whole by the pair of electrode joining parts, the coupling part, and the pair of rejoinable parts, wherein the coupling part includes a connection tab part and a notch part, wherein the connection tab part is a portion to which the detection conductor is electrically connected and which is formed to project from a center portion in an arrangement direction of the coupling part toward one side along the width direction to have a plate shape, and the notch part is formed as a part notched in a recessed shape along the width direction, wherein the notch parts are respectively disposed on both sides in the arrangement direction of the connection tab part in the coupling part, wherein the notch parts are disposed, as a pair, on both sides of the coupling part to be opposed to each other in the width direction, so that the pair of the notch parts opposed to each other in the width direction is assumed to be one group, and two groups of the notch parts are respectively disposed on both sides in the arrangement direction of the connection tab part, and the pair of electrode joining parts and the coupling part constitute a conductive connection part that is disposed across the different electrode terminals to electrically connect the different electrode terminals to each other.