PURPOSE: To deal with two kinds of flasks of large and small sizes in one set of molding machine by using all squeeze feet to the flask having larger inside size and the inside squeeze feet to the flask having smaller inside size.

CONSTITUTION: In the case of executing molding by using a large pattern plate 2, large flask 3 and large upper auxiliary flask 5, by changing over a port change-over valve, cylinders 9a, 9b are extended to ascend the large pattern plate 2 and the large flask 3. Then, the squeeze feet 8a, 8b are advanced into the large upper auxiliary flask 5 and the molding sands in the large upper auxiliary flask 5 and the large flask 3 are squeezed. On the other hand, in the case of executing molding by using a small pattern plate 20, small flask 21, small upper auxiliary flask 6, etc., by changing over the change-over valve, only the inside cylinders 9a, 9b are extended to descend only the inside squeeze feet 8a, 8b. The small flask 21 and the small upper auxiliary flask 6 charged with the molding sands, are ascended and only the inside squeeze feet 8a, 8b are advanced into the small upper auxiliary flask 21 to squeeze the molding sand.