Abstract: A control device includes an arm (12) for mounting an instrument and at least one motion sensor (16) to be placed on the operator (2) of the control device and equipped to sense the movement of the operator according to the degree of freedom of the mounting arm (12), the device including an element (20) for processing signals emitted by the motion sensor (16), the element (20) being equipped to process the signals emitted by the motion sensor (16) and to send the corresponding control signals to the mounting shaft (12) so that the movement sensed by the motion sensor (16) controls the corresponding movements of the mounting arm (12). The device also includes an element for starting and stopping the detection of the motion of the operator by the sensor (16).