Problem to be solved: to provide a medical container with a small discoloration and excellent transparency by electron beam and gamma ray irradiation.A medical vessel comprising a copolymer comprising. Alpha. - olefin unit (a) of C2-20, cyclic olefin unit (b), and aromatic vinyl unit (c) of formula (C-1).No selection【課題】電子線、ガンマ線照射で変色が少なく、かつ透明性に優れる医療用容器の提供。【解決手段】C2~20のα-オレフィン単位(A)と、環状オレフィン単位(B)と、式(C-1)の芳香族ビニル単位(C)から成る共重合体を含む医療用容器。【選択図】なし