BUSBAR MODULE

A busbar module (1) includes: busbars (2) fixed to battery cells of a battery module; a plate-like flexible circuit body (3); and a case (4) that accommodates the circuit body and the busbars, in which the circuit body includes a trunk portion (30) extending in a first direction (X) in which the battery cells are arranged, and branch portions (31) branching from the trunk portion and connected to the busbars, the branch portion includes a base portion, a fixed portion (34) fixed to the busbar, and an intermediate portion (33) extending from the base portion to the fixed portion in the first direction, a first end portion (30c) of the trunk portion has a first through-hole (30e), and the case includes a first protrusion (46) and locks the first end portion with the first protrusion to hold the circuit body in a state where the intermediate portion is flexurally deformed.