The present invention provides a pipe joint structure which is large in pull-out resistance and excellent in sealing performance and capable of performing pipe arranging and connecting work easily andquickly. The pipe joint structure includes a joint body (10) and pressing and holding retainer rings (3) attached to the joint body (10). A plastic processing rib (9) is arranged on the thin-walled metal pipe (4) in a projecting manner, clamping rings (1,2) are used for to clamping and holding inner and outer gradient surfaces of the rib (9) with the joint body (10) and the pressing and holding retainer rings (3), and the pressing and holding retainer rings (3) stop each other relative to a front end of the joint body (10) via small-angle rotation in the axial direction and in the radial direction; a pricking member (32) is provided, and the rotation of the pressing and holding retainer rings (3) is inhibited by the pricking member (32). .