BATTERY MODULE

A battery module 10 includes: a plurality of connecting members 20 electrically connecting electric terminals 13A and 13B of adjacent electric cells 11; and a flexible flat cable 30 formed by flatly encapsulating an outer circumference of a flat conductor 34 with an insulating resin 33 and joining the plurality of connecting members 20. Portions of the flexible flat cable 30 to be disposed between adjacent connecting members 20 and 20 are provided with folded portions 31 formed by folding the flexible flat cable 30 at folded lines 31A. The folded lines 31A extend in a direction crossing a longitudinal direction of the flexible flat cable 30.