To provide an extrusion die capable of easily extruding an aluminum shape material composed of a base part and a plurality of fin sections in a stable posture, and extruding its service life.

The extrusion die 10 extrudes, for shaping, an aluminum shape 1 formed with a base part 2, and a plurality of fin sections 3 formed integrally, continuously in sequence with this base part 2, and includes: a billet guide recess 11 provided on an upstream side edge surface in the extruding direction of a billet 40; a base part forming through-hole 12 for forming the base part 2, which comes in communication with the billet guide recess 11; and fin section forming grooves 13 that come in communication with the billet guide recess 11 and form a plurality of fin sections 3. The fin section forming grooves 13 are made to be of such a shape in which the fin section forming grooves 13 respectively evenly expand from the groove entrance holes 13A on the upstream side in the extruding direction of the billet 40 toward the groove exits 13B at the downstream side.