A wiring module to be attached to a battery module including a single cell group in which a plurality of single cells having positive and negative electrode terminals are lined up includes a connection member that is made of aluminum or an aluminum alloy and that electrically connects adjacent electrode terminals to each other and a voltage detection wire formed by coating a core wire made of aluminum or aluminum alloy with an insulation coating. An exposed core wire that is exposed at an end portion of the voltage detection wire is connected to the connection member by welding.