A tire-lever device for tire-changing machines includes a substantially vertical support arm associated with a tire-changing machine and having upper and lower ends; a pair of substantially vertical and parallel plates integrally extending from the opposite lower end; a connecting rod system, hinged between the pair of plates and including first and second connecting rods; a tire-lever tool with an elongate body defining an upwardly-facing first end and a second end opposite thereto, formed as a hook portion and hinged to the first and second connecting rods and forming an articulated quadrilateral with the latter and said plates; an actuator rotatably actuating the connecting rod system and mounted onto the support arm; a connector element connecting the actuator to the connecting rod system and defining an end hinged to the actuator and an opposite end directly hinged to the first end of the elongate body of the tire-lever tool.