Provided is a curable composition which has excellent curability, less causes silicone molds to swell, and allows the silicone molds to have better durability and a longer service life in repeated use. The curable composition according to the present invention is a curable composition for production of an optical component by molding using silicone molds. The curable composition contains curable compounds and a cationic initiator. The curable compounds include (A) a cycloaliphatic epoxy compound and (B) an oxetane compound. The oxetane compound (B) is present in a content of 10 to 45 weight percent of the totality of all the curable compounds contained in the curable composition. Of the totality of all the curable compounds contained in the curable composition, 90 weight percent or more is a compound or compounds having a solubility parameter of 9.0 (cal/cm3)1/2 or more as determined at 25° C. by the Fedors' method.