A bus bar module includes a circuit body, a bus bar, a bracket, and a cover configured to be mounted to the bracket to protect the circuit body and the bracket. The circuit body includes: a strip-shaped main line extending in a first direction; a strip-shaped branch line extending from the main line so as to branch from the main line; and a connecting portion positioned closer to the distal end ofthe branch than a folded portion of the branch line. The cover is configured to expand and contract in the first direction corresponding to the expansion and contraction of the bracket in the first direction.