A main body for a tire anti-skid device characterized by comprising: a first main body having a first grounding planar part extending in a circumferential direction of a tire while facing a tread part of the tire, the tire being fitted to a vehicle wheel, an inner rear connecting part provided on a rear side of the first grounding planar part on an inside of the tire, and an outer front connecting part provided on a front side of the first grounding planar part on an outside of the tire; and a second main body arranged to the rear of the first main body, having a second grounding planar part extending in the circumferential direction of the tire while facing the tread part, an inner front connecting part provided on a front side of the second grounding planar part on the inside of the tire, and an outer rear connecting part provided on a rear side of the second grounding planar part on the outside of the tire; wherein the term "inside" refers to a side configured to be a vehicle side, the term "outside" refers to a side configured to be a non-vehicle side, and the term "front" and "rear" refer to a direction in which the tire rotates during forward travel; said first main body being a first U-shaped main body substantially U-shaped in cross-section and having a first inside planar part continuous with an inside shoulder part of said first grounding planar part and extending in the circumferential direction while facing an inside sidewall part of said tire, and a first outside planar part continuous with an outside shoulder part of the first grounding planar part and extending in the circumferential direction while facing an outside sidewall part of the tire; said second main body being a second U-shaped main body substantially U-shaped in cross-section and having a second inside planar part continuous with an inside shoulder part of said second grounding planar part and extending in the circumferential direction while facing the inside sidewall part, and a second outside planar part continuous with an outside shoulder part of the second grounding planar part and extending in the circumferential direction while facing the outside sidewall part; an included angle between front and rear ends in the circumferential direction of said first grounding planar part or said second grounding planar part and a center of rotation of the tire being 10° to 60°; and the inner rear connecting part of the first main body and the inner front connecting part of the second main body being connectable; characterized in that: the first main body comprises an elastic material and the second main body comprises an elastic material; wherein said elastic material is a rubber or a resin. a first main body having a first grounding planar part extending in a circumferential direction of a tire while facing a tread part of the tire, the tire being fitted to a vehicle wheel, an inner rear connecting part provided on a rear side of the first grounding planar part on an inside of the tire, and an outer front connecting part provided on a front side of the first grounding planar part on an outside of the tire; and a second main body arranged to the rear of the first main body, having a second grounding planar part extending in the circumferential direction of the tire while facing the tread part, an inner front connecting part provided on a front side of the second grounding planar part on the inside of the tire, and an outer rear connecting part provided on a rear side of the second grounding planar part on the outside of the tire; wherein the term "inside" refers to a side configured to be a vehicle side, the term "outside" refers to a side configured to be a non-vehicle side, and the term "front" and "rear" refer to a direction in which the tire rotates during forward travel; said first main body being a first U-shaped main body substantially U-shaped in cross-section and having a first inside planar part continuous with an inside shoulder part of said first grounding planar part and extending in the circumferential direction while facing an inside sidewall part of said tire, and a first outside planar part continuous with an outside shoulder part of the first grounding planar part and extending in the circumferential direction while facing an outside sidewall part of the tire; said second main body being a second U-shaped main body substantially U-shaped in cross-section and having a second inside planar part continuous with an inside shoulder part of said second grounding planar part and extending in the circumferential direction while facing the inside sidewall part, and a second outside planar part continuous with an outside shoulder part of the second grounding planar part and extending in the circumferential direction while facing the outside sidewall part; an included angle between front and rear ends in the circumferential direction of said first grounding planar part or said second grounding planar part and a center of rotation of the tire being 10° to 60°; and the inner rear connecting part of the first main body and the inner front connecting part of the second main body being connectable; characterized in that: the first main body comprises an elastic material and the second main body comprises an elastic material; wherein said elastic material is a rubber or a resin. the first main body comprises an elastic material and the second main body comprises an elastic material; wherein said elastic material is a rubber or a resin.