A busbar module includes: busbars that are fixed to battery cells of a battery module; a plate-like flexible circuit body that includes conductors corresponding to the busbars; and a case that accommodates the circuit body and the busbars, in which the circuit body includes a trunk portion and a branch portion connected to the busbar, the branch portion includes a base layer, a metal foil that is the connection conductor, and a coating layer that covers the base layer and the metal foil, the branch portion has a facing portion facing a first surface of the busbar, the metal foil is connected to a connection target at a portion that is more adjacent to a distal end than the facing portion is, and the first surface has a groove-shaped recess provided at a portion facing the metal foil.