A battery module includes a partition wall to separate an upper space from a lower space, a first plate that defines the upper space together with the partition wall, and a second plate that is disposed above the first plate such that a gap is left between the first and second plates. A case has an opening that is formed to let the gap communicate with an outside of the case. The first plate has a through hole through which the upper space and the gap communicate. The battery module further includes a through path passing through the partition wall and each of the plates to let the lower space communicate with a space above the second plate. The upper space and the gap constitute an exhaust duct, while the lower space and a top space constitute a cooling duct.