To provide a new binding particularly suitable for a short ski, capable of being automatically mounted, being demounted in a single operation, and being lightened and miniaturized with a simple structure, with secured mounting force and impact absorbability.

A raised body capable of being crushed and expanded by stepping pressure and recovering its original shape by pulling a pulling tool, is mounted on a boot mounting part attached to an intermediate part of the ski, and a ski boot rear end stopper advanced by being crushed and expanded is mounted on the raised body through a main spring, so that the rear end stopper is advanced by the crushing and expanding of the raised body when a person wearing the ski boot gets on the boot mounting part, whereby a rear end of the ski boot is automatically stopped. The elastic stopping of the rear end of the ski boot is released in a single operation only by retracting the pulling tool and releasing the stepping pressure.