Abstract: An object of the present invention is to provide a method of manufacturing a foam molded article in which upstanding portions are formed on a peripheral edge of a main body portion inexpensively by greatly increasing a yield of a mold. To achieve this object, in a manufacturing method for a foam molded article, a plate surface of the main body portion on a side where the upstanding portions is molded by side surfaces 21b, 31b of a continuous projecting portion defined when a male mold 20 and a female mold 30 are clamped such that projecting portions 21, 31 formed respectively on the male mold 20 and the female mold 30 are inserted into each other alternately, and inner surfaces of the upstanding portions are molded by tip end surfaces 21a, 31a of the projecting portions inserted into each other alternately when the male mold and the female mold are clamped.