The present invention relates to a run flat support body for a tire connection structure, the tire (T) the liner is installed on the outer periphery of a vehicle wheel (1) to be installed (2) it is combined in 3 divided form on the outer circumference formed with each call type and, connected with the coupling hole (11) for fastening connecting bolts 12 to a side end portion (10A) (10B) is formed connecting segment (10-1) and the first and second fastening segments (10-2,10- 3) and in the connection structure of the tire run-flat support body (10) made, including the nut 13, which is fastened to the connection bolt 12, the fitting hole (11 in the nut 13 is connected to the end (10A) ) are molded to be purchased and connected to the structure which is fastened with the connecting bolt 12, the wedge-shaped having a triangular cross-section in the boundary portion inner diameter is in contact with the outer race and the tire (T) of the vehicle wheel 1, the jig (a) at one end by inserting a side made of a coupling and separation of the vehicle wheel 1, the tire connection bolt 12 from the connecting end (10A) (10B) of the run-flat support 10 to secure a space on the inside diameter of the (T) the bar, characterized in, that each part is divided in the connecting end of the run flat support to be combined into a circle, clamp the hook hole formed at the first and second fastening segments to a run-flat support body in the position encompassing the outer circumference of a vehicle wheel or the liner walk giving pulling in the direction of the mutually facing, install the first and second fastening segments connected end side of the coupling hole to match directly the service class, because it easy to connect to the through-pin of the split-type one-piece vehicle wheel or wheels of the vehicle the run-flat support assembly is made easy because the installation possible.