PURPOSE: To provide an optical molding device capable of stably and precisely achieving the fine working by the optical molding method.

CONSTITUTION: A work table 4 is dipped in a container 1 filled with the liquid photosetting resin 2, and irradiated with the ultraviolet laser beam emitted from a laser beam source 6 through a window plate 3 by the raster scan method to form the layer of the hardened resin, and each layer of the hardened resin is laminated while repeating the operation to form an article of three dimensional shape. The movement of a scanner 7 which is an optical system parts and the opening/closing of a shutter 8 are interlockingly and alternately controlled by a personal computer 10 so that the scanning and the irradiation of the laser beam are alternately realized by the dot unit corresponding to the laser beam spot along each scanning line of the raster scan based on the CAD data 9.