A battery module includes: a plurality of battery cells mutually laminated in a first direction and forming a laminated structure; a pair of end plates being in surface contact with a first and a second ends of the laminated structure in the first direction; and a pair of busbar assemblies disposed at the first and the second ends of the laminated assembly in a second direction perpendicular to the first direction, each bus bar assembly of the pair of bus bar assemblies including a busbar configured to mutually join electrodes of the plurality of battery cells located at the first and the second ends of the laminated structure in the second direction, a circuit board on which an electrical connection to the busbar is formed, and a connector installed on the circuit board and electrically connected to the busbar assembly through the circuit board.