Polypropylene resin composition

A polypropylene resin composition comprising:

• from 50 to 94% by weight of a polypropylene resin (A),
• from 1 to 25% by weight of an ethylene-α-olefin copolymer rubber (B) which includes ethylene units and α-olefin units having 4-12 carbon atoms and has a density of from 0.850 to 0.875 g/cm3, and
• from 5 to 25% by weight of an inorganic filler (C), provided that the overall amount of the polypropylene resin composition is 100% by weight,
• wherein the polypropylene resin (A) is a propylene-ethylene block copolymer (A-1) satisfying requirements (1), (2), (3) and (4) defined below or a polymer mixture (A-3) comprising the propylene-ethylene block copolymer (A-1) and a propylene homopolymer (A-2),
• requirement (1):
• the block copolymer (A-1) is a propylene-ethylene block copolymer composed of from 55 to 85% by weight of a polypropylene portion and from 15 to 45% by weight of a propylene-ethylene random copolymer portion, provided that the overall amount of the block copolymer (A-1) is 100% by weight,
• requirement (2):
• the polypropylene portion of the block copolymer (A-1) is a propylene homopolymer or a copolymer composed of propylene units and 1 mol % or less of units of a comonomer selected from the group consisting ethylene and α-olefin having 4 or more carbon atoms, provided that the overall amount of units constituting the copolymer is 100 mol %,
• requirement (3):
• the weight ratio of the propylene units to the ethylene units in the propylene-ethylene random copolymer portion of the block copolymer (A-1) is from 75/25 to 35/65,
• requirement (4):
• the propylene-ethylene random copolymer portion of the block copolymer (A-1) comprises a propylene-ethylene random copolymer component (EP-A) and a propylene-ethylene random copolymer component (EP-B), wherein the copolymer component (EP-A) has an intrinsic viscosity [η]EP-A of not less than 1.5 dl/g but less than 4 dl/g and an ethylene content [(C2′)EP-A] of not less than 20% by weight but less than 50% by weight and the copolymer component (EP-B) has an intrinsic viscosity [η]EP-B of not less than 0.5 dl/g but less than 3 dl/g and an ethylene content [(C2′)EP-B] of not less than 50% by weight and not more than 80% by weight.