DRIVE APPARATUS

A drive apparatus is provided, including: an electric motor; a gear that is mechanically connected to the electric motor; an electric power control unit that is electrically connected to the electric motor; and a casing that houses the electric motor, the gear, and the electric power control unit. The casing includes a fixation portion to which an electric unit for function expansion is attached in a detachable manner and a connection portion by which the electric unit fixed to the fixation portion is electrically connected to the electric power control unit.