To machine a desired bottomed cylindrical body by smoothly and appropriately implementing the draw-spinning and the iron-spinning on a plate stock with a simple constitution.

A work 4 of a plate stock is held in a non-rotational manner by a bottom part of a core 3 formed in the shape as the contour of a bottomed cylindrical body targeted to be machined, and a holding bar 41 concentrically opposite to the core. The work of the plate stock is pressed and deformed to implement the draw-spinning and the iron-spinning to form the bottomed cylindrical body so that an inner surface is matched with the contour shape of the core while a plurality of rollers 28 to be revolved at equal intervals around the core and the holding bar on the circumferential locus of the same diameter are moved in the axial direction of the core and the holding bar and the revolving locus diameter of the rollers is simultaneously changed.