PURPOSE: To prevent the lowering of the accuracy of a three-dimensional model by providing a smoothing means scraping off the necessary buildup of the level of the photo-setting resin solution covering a photo-set layer above a molding stand in an optical shaping apparatus forming a three-dimensional resin model by the irradiation of the photo-setting resin solution with laser beam.

CONSTITUTION: An optical shaping apparatus 11 is constituted of a resin solution storage means 21 containing a storage tank 22 having a photo-setting resin solution 15 received therein, a light means 31 raising and lowering a molding stand 32 within the storage tank 22 and a laser irradiation means 41. After a photo-set layer is formed by irradiating the surface of the resin solution 15 with laser beam, operation allowing the molding stand 32 to fall by definite quantity is repeated to stack photo-set layers to produce a three-dimensional resin model. In this apparatus, a smoothing means 61 horizontally moving a smoothing plate 62 through a feed screw part 64 by the operation of a motor 65 is arranged above the molding stand 32. By this smoothing means 6, the surface S of the resin solution 15 is smoothed prior to a beam irradiation process and the photo-set layer can be accurately formed.