Abstract: A mold mounting apparatus having a mold holding apparatus provided on one side at the end of rails, for positioning and holding a mold; a second mold holding apparatus provided on the opposite side of clamping machines of an injection molding machine and the rails, for preheating, positioning and holding the mold in place; a mold delivery apparatus for delivering the mold to two clamping machines; and a mold carrying apparatus for receiving and delivering the mold among the mold holding apparatus, the second mold holding apparatus, and the mold delivery apparatus, and for conveying the mold along the rails. According to this mold mounting apparatus, the mold can be automatically carried into, and out of, all of the clamping machines after the mold has been brought into the mold holding apparatus, thereby improving mold changing operation efficiency and saving a space for the molding process.