The present invention relates to an assembled battery. The assembled battery comprises a plurality of single batteries (10), and a gas exhaustion path (S1) which is used for discharging the gas discharged by the single batteries (10) to the external part through the assembled battery (1). The assembled battery is characterized in that: a fin shaped portion (511) is formed on a wall surface of the gas exhaustion path (S1), and a sheet member (80) is disposed between the gas exhaustion path (S1) and the plurality of the single batteries (10). The single batteries (10) are tube-shaped batteries (10). The single batteries (10) are configured a radius direction of the single batteries (10). The sheet member (80) is kept in contact with a bus bar which is used for connecting terminals (11, 12) of the adjacent single batteries in the radius direction.