To provide a high performance all automatic dryer for a resin pellet which is homogeneous by preventing irregularity in drying and can remove humidity in a short time.

When a resin pellet for molding is dried, a 'first in, first out' theory is practiced by a screw mechanism to prevent 'irregularity in drying' and 'discoloration and change in quality owing to overheating', and 'deterioration of raw material' is prevented by being equipped with a 'breathing mechanism' to provide a homogeneous and high performance dryer.