To execute a hose mounting work without being affected by the other working processes, such as a bending, heating or the like by forming at least one recessed part in a circumferential direction on a position separated from a point at a hose mounting side through a hose mounting margin.

When a rear end 12 of a punch 10 accomodated in an engagement port 13 of a chuck 3 is pressed by a taper surface 20 of a chuck body 1, the punch 10 is slide in the radial direction of a pipe 2, and a point part 11 projects into a holding recessed groove 6, and presses an outer peripheral surface of the pipe 2 at a position of a mounting margin. Four recessed parts 14 are formed on the outer peripheral surface of the pipe 2 at 90 degree intervals, and the marking of a mounting margin is formed for distinguishing the insertion amount of the pipe 2. Whereby the marking can be definitely distinguished and the hose can be efficiently mounted onto the pipe.