A power source device includes: a battery assembly (40) including a plurality of battery cells (4) which are aligned; a bus bar module (6) formed by linking a plurality of bus bar storing portions (61) which store a plurality of bus bars (1) which link and connect electrodes (41, 42) of the battery assembly; a smoke exhausting duct (3) provided on one side of the battery assembly; and a control board (2) provided on the smoke exhausting duct and electrically connected to a voltage detection terminal for detecting a voltage of each of the battery cells.
