A surgery manipulator arm according to an embodiment may include an arm body and a translation mechanism provided to a distal end portion of the arm body. The translation mechanism includes: a proximal side unit connected to the distal end portion of the arm body; a distal side unit including a tool holding part to which a surgical tool is attached; a connection unit connecting the proximal and distal side units; and an electrical wiring circuit electrically connecting the proximal and distal side units. The connection unit includes first and second pulleys; and a belt member wound around the first and second pulleys. The proximal and distal side units are attached to first and second attachment positions of the belt member such that the distal side unit moves in a direction opposite to a direction in which the proximal side unit moves in association with movements of the belt member.