Abstract: A flaskless stack molding machine comprises a frame on which along the production process line a flask molding means and a means for separating flasks from the molds and assembling the molds into stacks are sequentially mounted. The means for separating the flasks from the molds and assembling them into stacks is provided with a stack-assembling bottom carriage mounted for vertical movement on guides attached to the frame and a bottom plate secured over the bottom carriage. The frame also supports a mechanism for transporting the flasks freely placed thereon. The means for separating the flasks from the molds and assembling them into stacks incorporates a top carriage for separating the flasks from the molds, which is for vertical movement on the guides secured on the frame and is arranged between the bottom carriage and the bottom plate. A drive means for vertical motion of the top carriage is secured on the frame and a drive means for the bottom carriage is rigidly affixed on the top carriage.