Provided are an angular resin container, which while being thin, retains excellent appearance in respect of luster, transparency or the like, as well as a blow molding die for subjecting the container to biaxial stretch blow molding. Biaxial stretch blow molding is conducted with a blow molding die having a scallop height for the surface of the blow molding die, that corresponds to the side wall part of the body part of the angular resin container, of 3 to 30 μm, thereby to obtain an angular resin container having a thickness of the body part of 0.5 mm or less and in which a horizontally-directed processed part having a depth of 3 to 30 μm is formed on the outer surface of the side wall part of the body part.