To reduce frictional resistance against a tire surface, generate even tension on the whole and prevent local deformation by applying polysiloxane expressed in a specific expression to at least a portion contacting with the tire, in an anti-slip device for tire made of a resin material and the like.

This anti-slip device for tire is formed like a net having a structure where rubber or resin is reinforced by a string or cord. Polysiloxane expressed in an expression I or II is applied to at least a portion with which the tire contacts. In the expressions, R1 to R4 designate alkyl group with carbon number of 1 to 3, or aromatic hydro-carbon with carbon number of 6 to 14, m designates integers 1 to 10,000, n designates integers 1 to 1,000, and X and Y designate organic residue containing a polar group. The polysiloxane as such is applied to the portion where the anti-slip device contacts with the tire. Thereby, when mounted on the tire, the anti-slip device can be easily moved in a predetermined position, thus enabling easy installation of the tire without deformation.