Polyolefin resin composition

A polyolefin resin composition comprising

• (a) 50-94% by weight of a polypropylene/ethylene-propylene copolymer composition,
• (b) 5-40% by weight of an ethylene/α-olefin copolymer rubber and
• (c) 1-10% by weight of a hydrogenated diene block copolymer, the sum of components (a), (b) and (c) being 100% by weight,
• wherein the polypropylene/ethylene-propylene copolymer composition (a) comprises 60-95% by weight of a polypropylene component and 5-40% by weight of an ethylene-propylene copolymer component having an ethylene content of 30-80% by weight, the polypropylene component has an isotactic pentad ratio (P) of not less than 0.96 and a Mw/Mn (Q value) of not more than 6, and a ratio of the maximum melt flow rate (MFRmax) to the minimum melt flow rate (MFRmin) has the following relationship
• 0.1≦Log(MFRmax/MFRmin)≦1
• and further the polypropylene/ethylene-propylene copolymer composition (a) has the following relationship between the melt flow rate of the polypropylene component (MFRPP) and the melt flow rate of the ethylene-propylene copolymer component (MFREP)
• 3≦Log(MFRPP/MFREP)≦7
• the ethylene/α-olefin copolymer rubber (b) is a copolymer of ethylene and an α-olefin of 4 or more carbons, has an ethylene content of 25-90% by weight and contains a polyethylene crystal having a long period of 6-14 nm as determined by a small angle X-ray scattering, and
• the hydrogenated diene block copolymer (c) is A-B or A-B-A block copolymer wherein A segment is a 1,4-polybutadiene block and B segment is a 1,2-polybutadiene block, a polyisoprene block or a butadiene/isoprene copolymer block, not less than 85% of unsaturated bonds therein being hydrogenagted.