A medical material that is excellent in antithrombogenicity even under a severe use condition in which thrombi are easily formed, is provided. The medical material contains a water-insoluble copolymer including a repeating unit (A) (which is derived from acryloylmorpholine, for example) and a repeating unit (B) (which is derived from methoxyethyl acrylate, for example), in which the water-insoluble copolymer has 5 mole % to 20 mole % of the repeating unit (A) with respect to all constituent units of the copolymer.