For providing a simultaneous both-sided ironing-deep drawing process, producing vessels like metallic cans which strong enough in their use and, after having been used, can easily be squashed by hand or foot, the height difference between the inner die and outer die and the profile radii of the inner die and outer die have been changed to changed the longitudinal wall strength of tubular structures in the simultaneous both-sided ironing-deep drawing process, holding a work material between the inner die and outer die, and simultaneously ironing both-sides of the work wall, and thereby obtaining tubular structures.