A battery module includes: a cell stack which is constituted by stacking a plurality of cells, and includes a first surface, a second surface, a third surface, a fourth surface, a fifth surface, and a sixth surface; a pair of end plates which are disposed on the first surface and the second surface of the cell stack; and a pair of connection frames which connect the pair of end plates. The pair of end plates each includes: a plurality of column portions; a plurality of beam portions; and hollow portions formed by the column portions and the beam portions. The pair of the end plates each has a uniform width in a stacking direction. In at least one beam portion of the plurality of beam portions, a width of a central portion is greater than a width of both end portions.