To provide a non-slip tool for a tire whereby the tire can be easily attached, and inconvenience in terms of handleability and costs can be prevented.

This non-slip tool for the tire is provided with a nonmetallic non-slip tool body 2 divided into net component pieces 2A and 2B along the longitudinal direction, and an aperture 6 is held between the divided pieces by an inner tightening cord 3 held on the inner side along the width direction. On the outer side along the width direction, a rotation type fastening tool 21 is provided together with an expansible outer tightening cord 4 so as to be unseparatable. The outer tightening cord 4 is held slidably with respect to a holding tool 13 provided on at least one portion on the width direction outer side of the net component pieces 2A and 2B.