To provide a connection joint of a tube which enables the connection state of a connecting member and a tube to be viewed and keeps the tensile strength reinforced in the axial direction.

A first joint member 10 and a second joint member 20 are coupled freely rotatably. The first joint member 10 has an antiskid part 11 on a tube member and adjacent to this, a connecting tube part 12 is formed at one end, a first male screw part 13 is formed at the other end, and an engaging recessed groove 14 is formed at an adjacent part to the antiskid part. The second joint member 20 has a coupling tube part 21 and a second male screw part 22 adjacent to this part formed by the tube member, and has an engaging projection edge 23 formed on the inside circumferential edge of an opening of the coupling tube part 21. The connecting tube part of the first joint member 10 is inserted into the coupling tube part of the second joint member 20 and the engaging projection edge 23 is fitted into the engaging recessed groove 14 and caulked. The screw shapes of the first and second male screw parts 13, 22 are made to fit the screw threads of a flexible tube.