To smoothly and easily take a resin molded product out of an injection mold without damaging by blowing off air to the molded product, cooling and taking out by means of adsorption.

The method of taking a molded product 1 (transparent optical element) out of an injection mold using a taking-out member 44 includes: generating an air current between the injection mold 12 and the molded product 1 by blowing off air to the molded product during or after opening of the injection mold 12; generating a negative pressure based on the air current; and adsorbing the molded product 1 in a non-contact state to take it out of the mold. In this case, the air having a temperature lower than that of the molded product 1 to be taken out is blown off. Thereby, the molded product 1 is cooled and can be taken out of the injection mold in the non-contact state by adsorption. According to this method, a cooling time as well as a working time required for injection molding can be shortened.