When an optical element is produced by sandwiching a resin between a pair of molds, the resin is cured while a mold is kept in contact with the resin until the temperature of the resin reaches a gel point. Throughout the process, a load cell monitors pressure exerted to the mold. After detection of a state in which the pressure exerted to the mold is a negative pressure, the resin is cured while the position of the mold is controlled so that the pressure exerted to the mold is increased to a predetermined positive pressure and thereafter the positive pressure is maintained.
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