Radiation-resistant polypropylene resin composition

A radiation-resistant polypropylene resin composition suitable for the preparation of molded articles in which physical properties scarcely deteriorate during sterilization by radiation, which comprises a propylene homopolymer having a syndiotactic pentad fraction of 0.7 or more, or a copolymer of propylene and an .alpha.-olefin other than propylene having 2 to 25 carbon atoms, in which in the absorption spectrum of .sup.13 C-NMR measured in a 1,2,4-trichlorobenzene solution, a peak intensity at about 20.2 ppm on the basis of tetramethylsilane occupies 0.5 or more of the total intensity of peaks attributed to methyl groups of propylene units, and at least one additive selected from the group consisting of a phosphorus-containing antioxidant, an amine-containing antioxidant, and a nucleating agent, which composition further comprises less than 50% by weight of at least one member selected from the group consisting of a polypropylene having an isotactic structure, a copolymer of propylene and an .alpha.-olefin other than propylene, and a polyolefin other than polypropylene.