A medical manipulator (1) has an end effector (13) and a long part (14). A first proximal-end part (20) is provided to a proximal-end side of the long part (14). When the first proximal-end part (20) is mounted to a motor unit (30), an engaging thread part (27) of the first proximal-end part (20) is pressed in toward a groove part (43) of an engagement-receiving part (42) of the motor unit (30). The engaging thread part (27) is then in contact with a tapered surface (44) of the groove part (43), and the engaging thread part (42) rotates the engagement-receiving part (42). When the engagement-receiving part (42) rotates until the groove part (43) is in the same direction as the engaging thread part (27), the engaging thread part (27) is completely engaged with the groove part (43). The engagement-receiving part (42) is thereby rotated by an actuator (33) of the motor unit (30), whereupon the rotation is transmitted to the engaging thread part (27). When the engaging thread part (27) rotates, a joint part (15) of the end effector (13) or the long part (14) moves. The engaging thread part (27) does not rotate when the first proximal-end part (20) is mounted to the motor unit (30), and there is therefore no unintended movement of the end effector (13) or the joint part (15).Linvention concerne un manipulateur médical (1) présentant un effecteur terminal (13) et une partie longue (14). Une première partie extrémité proximale (20) est fournie sur un côté extrémité proximale de la partie longue (14). Lorsque la première partie extrémité proximale (20) est montée sur un ensemble moteur (30), une partie denclenchement filetée (27) de la première partie extrémité proximale (20) est comprimée vers lintérieur en direction dune partie rainure (43) dune partie de réception denclenchement (42) de lensemble moteur (30). La partie denclenchement filetée (27) est alors en contact avec une surface conique (44) de la partie rainure (43), et la partie denclenchement filetée (42) fait to
