To obtain a vertical cutting surface without producing flaws and strain at the pipe end part of a pipe body in a cutting process for the pipe body, require neither separate device nor separate operation, and thereby reduce production costs.

This invention is concerned with a turning roll 1 on which a pipe body 2 is rested so as to be rotated, where each roll 3a and 3b is formed out of a cone roll in a head-cut conical shape, and it is so set up that the respective shafts 4a and 4b of the cone rolls 3a and 3b and respective ridges 5a and 5b are parallel with each other respectively as viewed in plan view, and respective upper surfaces of the rolls on which the pipe body 2 is rested, are made horizontal as viewed from the side, and paired cone rolls 3 are so formed that an increment and a decrement in the outer diameter of each cone roll 3a and 3b are made alternately.