BATTERY MODULE

A battery module includes: a duct (71) extending in a Y axis direction in which a plurality of battery cells (11) are stacked, to form a flow space (110) for gas; and an attachment-target member (30) to which the duct (71) is attached. The attachment-target member (30) has a first wall portion (111) and a pair of second wall portions (116) each rising from the first wall portion (111) in a Z axis direction, the pair of second wall portions (116) being provided with a space being interposed therebetween in an X axis direction. The duct (71) is disposed between the pair of second wall portions (116). The duct (71) has: a third wall portion (136) facing the first wall portion (111) in the Z axis direction with the flow space (110) being interposed therebetween; and a pair of fourth wall portions (131) extending, in the Z axis direction toward the first wall portion (111), from both end portions of the third wall portion (136) in the X axis direction, the pair of fourth wall portions (131) respectively facing the pair of second wall portions (116) in the X axis direction.