PROPYLENE-BASED POLYMER COMPOSITION AND INJECTION-MOLDED PRODUCT MADE THEREOF

Provided is a propylene-based polymer composition having good thermal stability and giving a molded product having good appearance when molded, and an injection-molded product excellent in appearance made thereof. The present invention a propylene-based polymer composition comprising a propylene-based polymer (A) as at least one propylene-based polymer selected from the group consisting of a propylene homopolymer (A-1) and a heterophasic propylene-based polymer (A-2), and the carbon black (D), wherein the content of the carbon black (D) is 0.001 part by weight or more and 1.7 parts by weight or less with respect to the total amount of the propylene-based polymer (A) being 100 parts by weight, the primary particle size of the carbon black (D) is 15 nm or more and 39 nm or less, and x defined by the following formula (1) is 1 or more and 430 or less. The composition of the present invention may be further comprise ethylene- ± -olefin copolymer (B), x = a × S wherein, a is the concentration (unit: atom%) of oxygen double-bonded to carbon on the surface of the carbon black, and S is the nitrogen adsorption specific surface area (unit: m 2 /g) of the carbon black.