The battery module includes a plurality of batteries stacked together, and separator disposed between an adjoining two of the plurality of batteries and configured to insulate between the adjoining two of batteries. Separator includes thermal conduction suppressor and position regulator. Thermal conduction suppressor has lower thermal conductivity than position regulator and suppresses thermal conduction between the adjoining two of batteries. Position regulator has higher rigidity than thermal conduction suppressor, has dimension in stacked direction of batteries equal to or greater than dimension of thermal conduction suppressor in stacked direction, and abuts the adjoining two of batteries to regulate a position of each of the adjoining two of batteries in stacked direction.