BATTERY PACK

A battery pack (2) includes: an assembled battery (4) in which a plurality of batteries (3) are connected; a current applying wire (14) for applying an electric current to the assembled battery (4); a plurality of voltage detecting wires (17) for detecting voltages of the plurality of batteries (3); and a battery monitoring device (1) that measures internal impedances of the plurality of batteries (3). The battery monitoring device (1) is located between a positive electrode-side battery terminal (25a) and a negative electrode-side battery terminal (25b) of each of the plurality of batteries (3) that constitute the assembled battery (4). The plurality of voltage detecting wires (17) are routed radially from the battery monitoring device (1).