To improve control performance by suppressing grip force in a cross direction.

This device is provided with an antiskid main unit 1 coating a core material formed in net shape with rubber or synthetic resin. Here, in a grounded surface of the non-slip main unit 1, a pair of right/left link parts 11, 11 extended in a tire peripheral direction and a rudder part 12 extended in a tire width direction so as to connect a pair of the right/left link parts 11, 11 to each other are provided, in at least partly the link part 11, a thin thickness part 14 formed 1 to 3 mm thinner than the rudder part 12 is provided.