PURPOSE: To properly and rationally perform the charging and taking-out of a buffer container composed of a pre-molded pulp mold with respect to the press molding part.

CONSTITUTION: Buffer containers 1 are vertically stacked on a feed means A3 in such a state that the opening surfaces thereof are turned downwardly and the group of the upper containers 1 is separated upwardly from the lowermost container 1a and the container 1a is received in a pressure receiving mold 3. After the molded container 1a' is demolded, the group of the already molded containers 1' vertically stacked on a feed means C3 is raised and the demolding container 1a' is upwardly raised and the demolding containers 1a' are fed directly under the group of the containers 1a' and the container group is lowered.