A toe-piece for an Alpine ski binding, comprising: a plate fixable to a ski; a first jaw and a second jaw, each comprising an external end (30, 40), an internal end (31, 41), and a central body (32, 42) interposed between the external end (30, 40) and the internal end (31, 41), and arranged on the plate in such a way as to be opposite one another; wherein the central body of the first jaw is hinged to the plate with respect to a first hinge axis, and the central body of the second jaw is hinged to the plate with respect to a second hinge axis parallel to the first hinge axis; and wherein each external end (30,40) of the first jaw and the second jaw is provided with a pin (33, 43) for engaging a hole of a ski boot; the internal end of the first jaw and the internal end of the second jaw are hinged to one another with respect to a central hinge axis parallel to the first and second hinge axis (X, Y), in such a way that the first jaw and the second jaw are mobile such as to define two end configurations, open and closed; the second jaw further comprises: elastic means arranged between the relative internal end and the relative central body; a seating in the relative internal end; and at least a guide pin for supporting the elastic means, connected to the relative central body and partially inserted in the seating of the relative internal end such that during the movement of the second jaw from the open configuration to the closed configuration, and vice versa, the internal end is mobile along a guide pin, consequently determining a variable distance between the second hinge axis and the central hinge axis; characterised in that: the first jaw constitutes a rigid element which develops from the relative external end to the relative internal end, wherein the distance between the first axis and the central hinge axis remains constant during the movement of the first jaw from the open configuration to the closed configuration. a plate fixable to a ski; a first jaw and a second jaw, each comprising an external end (30, 40), an internal end (31, 41), and a central body (32, 42) interposed between the external end (30, 40) and the internal end (31, 41), and arranged on the plate in such a way as to be opposite one another; wherein the central body of the first jaw is hinged to the plate with respect to a first hinge axis, and the central body of the second jaw is hinged to the plate with respect to a second hinge axis parallel to the first hinge axis; and wherein each external end (30,40) of the first jaw and the second jaw is provided with a pin (33, 43) for engaging a hole of a ski boot; the internal end of the first jaw and the internal end of the second jaw are hinged to one another with respect to a central hinge axis parallel to the first and second hinge axis (X, Y), in such a way that the first jaw and the second jaw are mobile such as to define two end configurations, open and closed; the second jaw further comprises: elastic means arranged between the relative internal end and the relative central body; a seating in the relative internal end; and at least a guide pin for supporting the elastic means, connected to the relative central body and partially inserted in the seating of the relative internal end such that during the movement of the second jaw from the open configuration to the closed configuration, and vice versa, the internal end is mobile along a guide pin, consequently determining a variable distance between the second hinge axis and the central hinge axis; characterised in that: the first jaw constitutes a rigid element which develops from the relative external end to the relative internal end, wherein the distance between the first axis and the central hinge axis remains constant during the movement of the first jaw from the open configuration to the closed configuration. the first jaw constitutes a rigid element which develops from the relative external end to the relative internal end, wherein the distance between the first axis and the central hinge axis remains constant during the movement of the first jaw from the open configuration to the closed configuration.