An object of this invention is to provide a case for rolling powder alloy without failures at the time of rolling. Each of these two portions has a rear part, a part of transversal middle plane as well as a front part. An evaluation section evaluates the system layouts generated by the system layout generation section on the basis of evaluation criteria designated in advance and stores a system layout evaluated most highly in a system layout storage section as a design result. The hydraulic control system may further include a first valve and a second valve coupled between the accumulator and the first and the second chambers of the swing motor. has a more acute angle relative to the longitudinal axis of the container, than the initiator portion. Finally, the mandrel patterns are outputted to form a photomask.