A polyolefin-based resin composition comprising: a polyolefin-based resin, and a hydrogenated block copolymer having a polymer block A mainly containing a vinyl aromatic monomer unit and a polymer block B mainly containing a conjugated diene monomer unit, wherein a mass ratio of the polyolefin-based resin/the hydrogenated block copolymer is 95 to 5 parts by mass/5 to 95 parts by mass, a total vinyl aromatic monomer unit content in the hydrogenated block copolymer is 12 to 25 mass%, a degree of hydrogenation of double bonds based on the conjugated diene monomer unit in the hydrogenated block copolymer is 90 mol% or more, and a melt flow rate value is 7 to 26 g/10 min.本發明係一種聚烯烴系樹脂組合物，其包含：聚烯烴系樹脂、及具有以乙烯基芳香族單體單元作為主體之聚合物嵌段A及以共軛二烯單體單元作為主體之聚合物嵌段B之氫化嵌段共聚物，且上述聚烯烴系樹脂/氫化嵌段共聚物之質量比為95~5質量份/5~95質量份，上述氫化嵌段共聚物中之所有乙烯基芳香族單體單元之含量為12~25質量%，上述氫化嵌段共聚物中之基於共軛二烯單體單元之雙鍵之氫化率為90莫耳%以上，熔體流動速率值為7~26g/10分鐘。
