A mold for foam molding which can sufficiently prevent burrs from being formed on a molded product, and a foam molding method using the mold are provided. A groove 6 into which a packing seal is to be fitted is formed in a mating surface 3a of a lower mold 3 so as to extend around a cavity 7. The groove 6 has a deep groove portion 6a which is deeply recessed from the mating surface 3a, and a shallow groove portion 6b which is located on the cavity 7 side with respect to the deep groove portion 6a and which continues to the deep groove portion 6a. A portion of the mating surface 3a that extends from its edge on the cavity 7 side down to the groove 6 has a width “a” of from 0.1 mm to 10 mm. A packing seal 5 has a base portion 5a which is inserted into the deep groove portion 6a, and an overhang portion 5b which continues to the base portion 5a and is engaged with the shallow groove portion 6b.