Molded foam

The present invention is a molded foam (foam duct (1)) having a tubular section (100a) with an open end (120a). A parting line (PL), which is formed during molding, extends to the open end (120a). The molded foam includes a protruding portion protruding from the parting line (PL) on one side of the parting line (PL) at least in the proximity of the open end (120a).