Battery module

A battery module has a cell unit 2 including battery cells 20, a positive external terminal 5 electrically connected to a positive side of the battery cells 20 through a positive electro conductive member 51, and a negative external terminal electrically connected to a negative side of the batterry cells 20. The positive electro conductive member 51 extends a first surface which is one of surfaces of the cell unit 20. The negative electro conductive member 52 extends of a second surface which is one of surfaces of the cell unit 20 other than the first surface.