PURPOSE:To obtain the hollow shaped material to be extruded with constant wall thickness by setting the wing part for preventing the eccentricity extendedly at the projecting part of the male die, and bringing the top end part of the wing part into contact with the inner side surface of the cavity, in which the material to be formed flows, of the female die in both dies combinated state. CONSTITUTION:The dies for extruding the hollow material to be formed is composed by combining the female dies 1 with the male dies 2. Then, the wing part 12 for preventing eccentricity is set in extending state to the side direction at the projecting part 8 for forming of the male die 2. the tip part 12a of this ring part 12 is made in contact with the inner side surface of the cavity 4, in which the material to be formed flows, of the female die 1 on the state of combining both dies 1, 2. In such a way, the projecting part for forming can be prevented from being made eccentric from its central position in the cavity for forming.
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