In a battery pack (1), first and second battery stacks (3, 5) are connected to each other via a connection member (7), each battery stack being formed by arranging multiple individual batteries (11) in a row direction. The connection member (7) is formed by repeatedly connecting a first connection part (13) and a second connection part (15), the first connection part (13) extending from the first battery stack (3) to the second battery stack (5) in an orthogonal direction, in which one end portion (13b) thereof supports the first battery stack (3) and another end portion (13a) supports the second battery stack (5), the second connection part (15) extending from the end portion (13b) of the first connection part (13) on the first battery stack (3) side toward the second battery stack (5) in a direction oblique to the orthogonal direction in a plan view.