PURPOSE: To reduce top and peak extrusion pressure and enlarge a range which can be extruded by optimizing the combination of a flowing in angle of material into a die, a hole diameter of the die, a tapered angle of the tip part of the material and the diameter of the billet.

CONSTITUTION: The value of the taper angle β of the tip part of the material the angle α, of the die is made ≤0.75, the end face of the tip part of the material is cut by ≥20mm to give a taper and the diameter(d) of the tip of the materil/the diameter D of the die hole is made ≤2.5. In this way, the value of the top and peak extrusion pressure Pr/a stationary extrusion prssure Ps is reduced and a range which can be manufactured by hot extrusion can bw widened. For example, when the stationary rolling pressure Ps and the top and peak pressure Pr are compared with each other as SUS304 is used for the extrusion material, the stationary extrusion pressure Ps does not change but the top and peak extrusion pressure is reduced in a combination of α=90° and β=30°.