Press device, and method of manufacturing elliptical-cylindrical member

The disclosure provides a press device that can form an elliptical-cylindrical member with high shape accuracy. One aspect of the present disclosure provides a press device that presses a flat metal stock into an elliptical cylinder. The press device comprises a first die, a second die, a third die, a first press mechanism and a second press mechanism. The first die has a shape of an elliptical cylinder. The second die has a first recess that forms a part of an elliptical-cylindrical space configured to arrange the first die therein. The third die has a second recess to be combined with the first recess to form the elliptical-cylindrical space. The first press mechanism inserts the first die along a radial direction of the first die to the first recess of the second die over which the flatmetal stock is placed so as to press the metal stock. The second press mechanism moves the third die relative to the first die inserted to the first recess so as to confine the first die and the metal stock in the elliptical