PURPOSE: To provide a molding machine in which compressed air enters into an inner space of a pattern supporting base through a gas venting nozzle after flowing through sand and the noise at the time, when the compressed air exhausts to the outer part therefrom, is reduced and the diffusion of the ultra- fine silica dust can be prevented.

CONSTITUTION: This molding machine for mold compressed by air, is provided with an opening hole 8 for removing the filtrated compressed air through a gas venting nozzle 2, and the opening hole is arranged in the same axis with the bottom part of a pattern supporting base 1 and a mold table 7 and connected with a tube 9 guided to the lower part of the floor level.