A fastener of a shoe on a snowshoe, comprising: - a front retaining member forming, in the fitted state, a retention for the front portion of the shoe, - a rear retaining member forming, in the fitted state, a retention for the rear portion of the shoe, where the rear retaining member comprises: - an interlocking wall, which comprises a central rear portion coming, in the fitted state, to bear against the upper portion of the user's heel and two side portions (10a, 10b) oriented towards the front, characterised in that the interlocking wall is movable along a front/rear axis between a rest and release position of the shoe towards the rear, and a retaining position of the shoe towards the front, and in that the rear retaining member also comprises: - two side connections (11a, 11b) located on either side of the central rear portion and connected at their upper end to the interlocking wall at its side connections (10a, 10b), and at their lower end to a bottom of the fastener, - forward pulling means, the actuation of which pulls the interlocking wall towards the front, and in that the pulling means comprise pulling cables (16a, 16'a - 16b, 16'b), and a winder, the actuation of which exerts a pull on the pulling cables (16a, 16'a - 16b, 16'b), the winder being arranged on a cover of the front retaining member, the pulling cables (16a, 16'a - 16b, 16'b), the interlocking wall and the front retaining member forming a tight loop, when the winder is actuated, on the top of the user's foot and around his ankle. - a front retaining member forming, in the fitted state, a retention for the front portion of the shoe, - a rear retaining member forming, in the fitted state, a retention for the rear portion of the shoe, - an interlocking wall, which comprises a central rear portion coming, in the fitted state, to bear against the upper portion of the user's heel and two side portions (10a, 10b) oriented towards the front, characterised in that the interlocking wall is movable along a front/rear axis between a rest and release position of the shoe towards the rear, and a retaining position of the shoe towards the front, and in that the rear retaining member also comprises: - two side connections (11a, 11b) located on either side of the central rear portion and connected at their upper end to the interlocking wall at its side connections (10a, 10b), and at their lower end to a bottom of the fastener, - forward pulling means, the actuation of which pulls the interlocking wall towards the front, - two side connections (11a, 11b) located on either side of the central rear portion and connected at their upper end to the interlocking wall at its side connections (10a, 10b), and at their lower end to a bottom of the fastener, - forward pulling means, the actuation of which pulls the interlocking wall towards the front, and in that the pulling means comprise pulling cables (16a, 16'a - 16b, 16'b), and a winder, the actuation of which exerts a pull on the pulling cables (16a, 16'a - 16b, 16'b), the winder being arranged on a cover of the front retaining member, the pulling cables (16a, 16'a - 16b, 16'b), the interlocking wall and the front retaining member forming a tight loop, when the winder is actuated, on the top of the user's foot and around his ankle.