A binding for ski mountaineering, comprising a plate fixable to a ski and a hooking device for hooking a ski boot to a ski; which ski binding is characterised in that: the plate is conformed in such a way that when it is fixed to the ski a chamber is identified between the ski and a first wall of the plate facing the ski; it comprises a slide which is positionable in the chamber and which comprises a second wall and a third wall, facing one another; the hooking device is fixable to the slide for sliding along the plate; it comprises a first coupling portion fixed to the first wall of the plate and which extends along the first wall; characterised in that it comprises a cursor comprising a second coupling portion conformed so as to couple with a first coupling portion, which cursor is positionable between the second wall and the third wall of the slide, in order to be able to slide between the second wall and the third wall, and the second coupling portion being facing the first coupling portion; it comprises movable locking means, for locking the cursor against the plate so that the second coupling portion couples with the first coupling portion; the movable locking means are arranged in the chamber and comprise: a wedge element which comprises a third coupling portion which forms a wedge and a first appendage which is accessible from outside when the binding is mounted; a fourth coupling portion which is part of the cursor and which is conformed so as to couple with the third coupling portion; elastic means; the cursor, the wedge element and the elastic means are reciprocally arranged and dimensioned so that the elastic means can press against the cursor and/or the wedge element, so that the third coupling portion couples to the fourth coupling portion with a consequent locking of the cursor to the plate, and so that it is possible to move the wedge element, by compressing the elastic means and acting on the relative first appendage, determining a decoupling of the third coupling portion from the fourth coupling portion with a consequent decoupling of the second coupling portion from the first coupling portion; the elastic means are further dimensioned so as to be compressed in a case in which the cursor is blocked to the plate and a force acts on the hooking device, which force is directed towards the second wall and exceeds a predetermined value. the plate is conformed in such a way that when it is fixed to the ski a chamber is identified between the ski and a first wall of the plate facing the ski; it comprises a slide which is positionable in the chamber and which comprises a second wall and a third wall, facing one another; the hooking device is fixable to the slide for sliding along the plate; it comprises a first coupling portion fixed to the first wall of the plate and which extends along the first wall; it comprises a cursor comprising a second coupling portion conformed so as to couple with a first coupling portion, which cursor is positionable between the second wall and the third wall of the slide, in order to be able to slide between the second wall and the third wall, and the second coupling portion being facing the first coupling portion; it comprises movable locking means, for locking the cursor against the plate so that the second coupling portion couples with the first coupling portion; the movable locking means are arranged in the chamber and comprise: a wedge element which comprises a third coupling portion which forms a wedge and a first appendage which is accessible from outside when the binding is mounted; a fourth coupling portion which is part of the cursor and which is conformed so as to couple with the third coupling portion; elastic means; the cursor, the wedge element and the elastic means are reciprocally arranged and dimensioned so that the elastic means can press against the cursor and/or the wedge element, so that the third coupling portion couples to the fourth coupling portion with a consequent locking of the cursor to the plate, and so that it is possible to move the wedge element, by compressing the elastic means and acting on the relative first appendage, determining a decoupling of the third coupling portion from the fourth coupling portion with a consequent decoupling of the second coupling portion from the first coupling portion; the elastic means are further dimensioned so as to be compressed in a case in which the cursor is blocked to the plate and a force acts on the hooking device, which force is directed towards the second wall and exceeds a predetermined value.