To improve durability by making a connecting mechanism hardly broken and to reduce work labor and to improve working efficiency by performing by one touch and easily connecting and releasing work.

The end part 4s of the outer peripheral face of a T-shank part 4 being one of divided bodies to be connected is formed by a tapered projected face 5 whose apex part side becomes gradually smaller diameter and the end part 3s of the inner peripheral face of a tube part 3 being another divided body is formed by a tapered recessed face 6 whose apex part side becomes gradually larger diameter and which is to be fitted to the tapered projected face 5 and a hooking projected part 7... is provided on one of the tapered projected face 5 or the tapered recessed face 6 and a hooking recessed part 8... in which the hooking projected part 7... is hooked and which has an L-shaped recessed path into the back end side of which the hooking projected part 7... advances when it is rotatably driven is provided on the other part.