The invention concerns a control device comprising a lever (12), having a globally circular shape about an axis of revolution (Z), articulated on a fixed support (14) and provided with a maneuvering proximal end (16). It also comprises an electrode (24) for detecting proximity of a user's hand relative to the end (16) for maneuvering the lever (12), and means (28) for electrically connecting said electrode (24) with a fixed electric circuit (26) borne by the support (14). The electrically connecting means (28) comprise an annular deformable conductive member (50) enclosing the lever (12) so as to contribute in masking said lever (12).