BATTERY MODULE

To hold cells while efficiently adjusting temperature of the cells, a battery module (1) includes: a plurality of columnar cells (20), and a holder (3) for holding the cells (20). The holder (3) includes cylindrical container portions (31) for containing the cells (20), respectively, refrigerant passages (34) and phase change elements (4) for adjusting temperature of the cells (20), and pressing walls (33) for pressing the cells (20) to bring outer circumferential surfaces of the cells (20) into contact with inner circumferential surfaces of the container portions (31), respectively. The holder (3) is made of an aluminum alloy.