Abstract: An apparatus is provided for exchanging metal molds for a molding machine that employs such molds. The apparatus includes a mold carriage capable of mounting thereon at least two metal molds and a mold transfer and exchange unit capable of transporting the mold to be exchanged from the carriage to the molding machine and to give and receive the molds horizontally. The apparatus includes a guide rail and an extension of said guide rail which pivots in a horizontal plane to effect the exchange of said molds.