According to one embodiment, a battery module includes a block-like battery cell unit in which a plurality of battery cells and a plurality of separators are stacked, and a frame which constrains the battery cell unit in a stacking direction of the battery cells and the separators. The frame is opposed to angular portions of end separators located at respective ends of the battery cell unit, as viewed in the stacking direction, and defines gaps with reference to the angular portions of the end separators.