BATTERY MODULE

A battery module includes: a duct (71) through which gas discharged from the battery cell flows; and an attachment-target member (30) to which the duct (71) is attached. The attachment-target member (30) has a first wall portion (116) and the duct (71) has a second wall portion (131). The first wall portion (116) is provided with a claw portion (121). The second wall portion (131) is provided with a groove portion (161). The groove portion (161) includes a first segment portion (166) and a second segment portion (167), the first segment portion (166) extending in the Y axis direction, the claw portion (121) being disposed in the first segment portion (166), the first segment portion (166) anchoring the claw portion (121) in the Z axis direction, the second segment portion (167) being opened at an end portion of the duct side wall portion (131) in the Z axis direction, the second segment portion (167) extending in a direction intersecting the Y axis direction, the second segment portion (167) being connected to the first segment portion (166), the second segment portion (167) allowing the claw portion (121) to enter the first segment portion (166) when attaching the duct (71) to the attachment-target member (30).