WIRING MATERIAL AND BATTERY MODULE

Provided is a wiring material which is advantageous for space saving while ensuring seismic resistance of a flexible circuit board. A wiring material including a flexible circuit board in which a plurality of batteries A to L arranged in one direction is connected to one another via a bus bar and an arrangement direction of the batteries A to L is a longitudinal direction of the flexible circuit board , includes: a narrow connecting portion connected to the bus bar ; and a main body that is connected to the connecting portion and includes a portion wider than the connecting portion . The connecting portion is configured to have a longitudinal extending portion that projects from the main body in the longitudinal direction and extends in the longitudinal direction.