PURPOSE: To realize a high speed extrusion, and to realize the improvement of the productivity of an extruded material without defects such as die line, gouge, etc. in a port hole die for the extrusion of a hollow material.

CONSTITUTION: A female die 2 is divided into preceding and succeeding female die composing members of a first female die composing member 9 with a forming hole bearing part 12 forming the outer peripheral part of a hollow material E and a second female die composing member 10 with a relief hole part 13b. This is a port hole die equipped with a groove 15 forming a cooling medium path 3 on either one or both of the mating surfaces of the first and the second female dies 9 and 10.