To provide an inside support device for a tire chain which is formed thin so as to be mountable even in a narrow space between a chassis and the inner side face of a tire, simple in constitution, excellent durability, suitable for mass production, economical, capable of fixing a wire to fastening plate positively, firmly and stably in a well-balanced manner without difficulty, restraining the wire from being cut off and free from the possibility of damaging the inner side face of the tire.

This inside support device is provided with a pair of fastening plates B, C and a plurality of chain fittings D. The fastening plates B, C are composed of suitable metal plates, and base end side lateral side parts and center parts are provided with fixing parts 2, 3, 6, 7 formed by bending tightening pieces in nearly U-shaped to tighten a wire A. The chain fitting D is formed of a fitting plate 10 formed of a suitable metal band plate, and a base end part is provided with a fixing part 11 formed by bending an end part in nearly U-shaped to tighten the wire A, while a tip part is provided with a folded part 12 formed by bending the end part in nearly U-shaped to swingingly mount a fitting ring 13 for fitting a cross chain G or the like.