Abstract: The provided is a power distribution device for a distribution board. The power distribution device distributes power to and connects a main circuit breaker, branch circuit breakers, an additional output terminal circuit breaker, and an additional output terminal circuit breaker, the power distribution device for a distribution board includes an upper housing, a lower housing installed on a floor, a connection module installed in a vertical direction at a side of the lower housing adjacent to the main circuit breaker, and the connection module includes a connection terminal, a connection member, a coupling member, an electrically conducting the fastening member, and a ring-shaped nut member.