To provide a tire anti-skid device of a motor vehicle in which structure for mounting a contact member coming in contact with a tire is simplified.

Anti-skid bodies 1a to 1c are fit in a tire T and are arranged. Each of the anti-skid bodies includes: a front-side U-shaped member 2 and a rear-side U-shaped member 3 which are disposed respectively at a tire rotation-direction front side and at a tire rotation-direction rear side upon the advancing of motor vehicle; and an interior linear member 4 along the inside surface of the tire. The front-side and rear-side U-shaped members include transverse parts 2a, 3a which transverse ground-contact area of the tire, exterior parts 2b, 3b along the outside surface of the tire and interior parts 2c, 3c along the inside surface of the tire, the interior parts are connected to each other by the interior linear member, and each anti-skid body has the contact member 6 which is disposed in the exterior part or the interior part and comes in contact with the outside surface or the inside surface of the tire, wherein the contact members have a cylindrical shape, the exterior parts or the interior parts of the front-side U-shaped members or the rear-side U-shaped members are arranged in the tire radial direction, the end parts of the exterior parts or the interior parts are bent and protruded forward or backward and the contact members are fit and attached to the protruding parts of the end sides of the exterior parts or the interior parts.