To provide an optical molding art capable of preventing the phenomenon of trap V.

The optical molding method is to mold a molding-required configuration by irradiating light on the free liquid level of optical curable liquid, and it comprises the steps of a process for determining as to whether a curing necessary area in each cross-section having the molding-required configuration sliced surrounds a curing unnecessary area or not, a process of molding the cross-section so that an uncured opening part is formed on at least a place in the curing necessary area in the case where the curing necessary are surrounds the curing unnecessary area as a result of determination in the determining process, and a process of curing the opening part at the time of molding a cross-section to be molded at the back of the cross-section with an opening part formed thereon.