A milling device (100) comprises a rotatable screw (110) in an outer periphery of which spiral grooves (110a, 110b) are formed; a barrel (120) surrounding the portion of the screw (110) where the spiral grooves (110a, 110b) are formed and in an inner periphery of which a spiral groove (120a) is formed; a loader (130) for loading cereal grains into a space (135) between the screw (110) and barrel (120); a compressor (140) attached to a distal end of the barrel (120) and accumulating and pressurizing in a nearly airtight state the cereal grains ground in the space (135) and fed therein as the screw (110) rotates; and a discharge port (150) provided in a front face of the compressor (140) and blasting the cereal grains fed in and pressurized by way of rotation of the screw (110).
