PURPOSE: To provide an extrusion device which uniformizes heat by eliminating temp. difference at each part of a die generated during extruding and in this result, can obtain an extruded material having desired shape dimension.

CONSTITUTION: A heat conductive member 5 having the thermal conductivity higher than that of the die material, is arranged in the die 1 under condition surrounding around a bearing part 3 regulating the outer shape of the extruded material and in the range from the position near the bearing part to the outer peripheral part 1b of the die. Otherwise, the heat conductive member 5' having the thermal conductivity higher than that of the die material, is arranged at an abutting surface or at the neiborhood of an adjacent member arranged at the inlet side of the die 1 on the die, under condition surrounding around the bearing part 3 of the die regulating the outer shape of the extruded material and in the range from the position near the bearing part 3 to the outer peripheral part 1b of the die. This heat conductive member 5' is combined with the die and the adjacent member under condition of contacting with or approaching to the die.