Abstract: A bellows pipe is manufactured, with an elastic body pinched between a collar and a stopper inside a raw pipe being deformed, by pressing the elastic body as to expand radially such that a circumferential portion of the pipe changes to an annular convex portion, pinching and compressing the annular convex portion by a chuck and a punch to form a bellows portion, and shifting the pipe a given distance while pinching the bellows portion by the chuck. A plurality of bellows portions are successively formed in the pipe by repeating the foregoing deforming steps.

Abstract: A bellows pipe is manufactured from a raw pipe, with an elastic body pinched between a movable core and a fixed core inside the raw pipe, by compressing the elastic body by axially moving the movable core to form an annular convex portion in the raw pipe, changing the annular convex portion to a bellows portion by axially moving a punch to press the annular convex portion, pinching the bellows portion between a chuck and a chuck inner block assembled therein, shifting the pipe a given distance by axially moving the chuck and chuck inner block holding the bellows portion therebetween, and repeating the foregoing steps. Therefore, a small-diameter raw pipe of smaller than 16 mm diameter can be deformed, the outer diameter, pitch, etc. of a bellows portion can be freely set, the elastic body is worn little.