To prevent deformation, etc., of each non-slip main body by enabling installation work to be carried out easily, and making tightening forces adjustable and to reduce manufacturing costs.

This tire non-slip, in which a plurality of non-slip main bodies 1 are connected together at their longitudinal ends and wound endlessly on a tire 43 and tightening ends 2a, 2b arranged in a circle along the side face of the tire 43 are fastened toward the center and mounted, connecting projections 3 are formed at both of the longitudinal tightening ends 2a of each non-slip main body 1 in such a way as to face inward. The tire non-slip has tightening tools 4 which, while the connecting projections 3 are connected to the adjacent inside tightening ends 2b, tighten the non-slip main bodies by being pulled in such a way that the distance between them decreases, each of the tightening tools 4 comprising an elastic connecting member 5 connected to the connecting projection 3 at one end, a tightening cord 6 connected to the elastic connecting member 5, and a winder 7 connected to the connecting projection 3 at the other end to wind the tightening cord 6.