To resist extension in an axial direction and rotation and to firmly fasten a pipe.

In this joint, a pair of half annular housings 2, 2 are provided, each housing has a parallel pair of engaging protruded parts 22 along a peripheral direction in both sides in a width direction, and flanges 23, 23, engaged astride annular grooves 61, 61 provided in the vicinity of each connection end face of two pipes 6, 6 connected with these engaging protruded parts 22 and extended to the diametric direction outside from both ends of the engaging protruded part 22, are mutually fastened to a mate flange by bolts 4, 5, so as to connect the two pipes. A locking protrusion part 25 continued in a peripheral direction is provided partly inside a pair of the engaging protruded parts 22, 22, and a plurality of locking pawl parts 26 are provided partly in the outside.