A resin composition containing 50 to 99% by weight of a norbornene polymer and 1 to 50% by weight of a hydrogenated styrene thermoplastic elastomer and having a weight average molecular weight of 1000 or less and a low molecular weight component content of 3% by weight or less is used. Thus, a medical drug container with very little protein adsorption over time is manufactured.ノルボルネン系重合体50~99重量%と水素添加スチレン系熱可塑性エラストマー1~50重量%とを含有する、重量平均分子量が1000以下の低分子量成分含量が3重量%以下である樹脂組成物を用いて、タンパク質の経時吸着のきわめて少ない医療用の薬剤容器を製造する。