Provided is a method for manufacturing a battery wiring module including: a coating step of coating a first long side portion of a flat plate conductor and a plurality of linear conductors following the first long side portion by a first insulating resin portion and of coating a second long side portion of the flat plate conductor and a plurality of linear conductors following the second long side portion by a second insulating resin portion; and a cutting step of cutting the insulating resin portion so that the plurality of busbars is divided into a plurality of busbar groups and the plurality of linear conductors coated by any one of the first insulating resin portion and the second insulating resin portion and the busbar groups are separated.