A medical material has a compound firmly immobilized on the surface thereof, which compound is capable of inhibiting both of the blood coagulation reactions in a primary hemostasis stage in which platelets are involved and in a coagulation thrombus formation stage in which blood coagulation factors are involved in a state retaining the anticoagulant activity. The present invention provides a medical material having a hydrophilic polymer compound immobilized on the surface thereof, in which a compound and a copolymer of monomers selected from the group consisting of ethylene glycol, vinyl acetate, vinyl pyrrolidone, propylene glycol, vinyl alcohol and siloxane are bound.
