A plasticization device used in a three-dimensional shaping device includes: a cylinder having a supply port through which a material is supplied; a spiral screw configured to rotate inside the cylinder; a first heating unit provided on an outer peripheral portion of the cylinder; and a nozzle provided on the cylinder and configured to discharge the material plasticized by rotation of the screw and heating of the first heating unit. The outer peripheral portion has, between the supply port and the nozzle, a first region and a second region from the supply port toward the nozzle, and the first heating unit is provided to make a temperature of the second region higher than a temperature of the first region.