Provided is a method for assembling an assembled battery and an assembled battery in which reliability to shock is improved. An assembled battery made from a plurality of single cells laminated in thethickness direction, wherein said battery is equipped with a pair of first cover members for covering the single cell group from both sides in the single-cell-lamination direction, and a pair of second cover members for covering the battery group from both sides in the direction intersecting the lamination direction, the pair of second cover members being joined with the pair of first cover members in a state where the battery group has been pressurized in the lamination direction by the pair of first cover members.