BUSBAR MODULE

A busbar module includes: a plurality of busbars that are fixed to a plurality of battery cells of a battery module including the plurality of battery cells; and a plate-like flexible circuit body that includes a plurality of connection conductors corresponding to the plurality of busbars, in which the circuit body includes a trunk portion extending in a first direction in which the plurality of battery cells are arranged, and a plurality of branch portions branching from the trunk portion and connected to the busbars, the circuit body includes a first circuit layer and a second circuit layer, and the branch portion has a thin portion composed of any one of the first circuit layer and the second circuit layer, and connects the trunk portion and the busbar in a state where the thin portion is flexurally deformed.