A motorized hinge device (1) has a first connection means (3) assigned to be fixed to a structure or framework of an appliance, and connected, at least by means of a connecting rod means (5), to a second connection means (7) assigned to be fixed to a door of the appliance. This second connection means (7) is hinged to the first connection means (3) by means of a hinge pin means (11). An actuator (13) has a body (15) fixed to the first connection means (3) and a movable member (17) which is movable with respect to the body (15) and is connected to the connecting rod means (5). In an operative condition, the actuator means (13) is operated to move, by means of the connecting rod means (5), the door around the hinge pin means (11) between extreme opening (A) and closing (C) conditions, and vice versa.