Battery module providing improved base plate

PURPOSE: A battery module is provided to effectively suppress the deformation by the load by installing a bending part for increasing rigidity on a base plate. CONSTITUTION: A battery module comprises a plurality of batteries(10) and a base plate(20) in which the batteries are installed. A reinforcing part against the load is arranged in the base plate. A groove accommodating the batteries by a bent portion is formed on the base plate. The bent portion is bent to protrudes to the battery. The interval between batteries widens by the bent portion.