To provide the connecting structure of a pipe body composing a structure mainly used outdoors such as a pergola and a playing toy.

This connecting tool 1 is composed to be provided with a collar shaped body 12 of the diameter a little smaller than the inside diameter of pipe bodies 21, 22 on both ends and near the center of a core material 11 of the diameter smaller than the inside diameter of pipe bodies 21, 22, a stopper body 13 of the larger diameter than the inside diameter of pipe bodies 21, 22 but approximately the same diameter as the outside diameter of pipe bodies 21, 22 in approximately the center of the core material 11, and a spring shaped body 14 between the collar shaped body 12 and the stopper 13 on the end. This connecting structure having the connecting tool 1 inserted into the end of respective pipe bodies 21, 22, the spring shaped body 14 abutting upon the inner wall of pipe bodies 21, 22, and the pipe body 21 and the pipe body 22 connected together serves to improve workability at the work site.