To provide an almost permanently usable binder for sports.

A ratchet belt with a plurality of sawteeth formed on the upper face is engaged with a ratchet type buckle with an engaging protrusion inside. One side of the sawteeth of the ratchet belt has a slanted surface and the other side has an almost vertical face to make a system that the engaging projection is caught by the vertical face to fix the ratchet belt so as not to be escaped from the buckle. In a binder in which length of the ratchet belt can be adjusted step-by-step along the sawteeth intervals by tightening the buckle, a concave and convex shaped ankle in which a slope surface slanted similarly with a slanted surface of the ratchet belt or slanted more than the same and a roughly upright surface are repeatedly formed, wherein said ankle is press-formed, and the ankle is insert-formed, so that a part of the upper side of the upright surface is exposed to the outside and is directly engaged with an engaging protrusion of the buckle.