In the present invention is that platelets can inhibit the both of blood coagulation reaction in the coagulation thrombus formation stage of which involved the stage and the blood clotting factor of primary hemostasis involved, holding the anti-blood clotting activity on the surface of the medical equipment or medical material to provide a hydrophobic polymer compound that can be firmly fixed. The present invention relates to a polymer compound that inhibits the adhesion of platelets, are bound is a compound that inhibits the blood coagulation reaction, provides a hydrophobic polymer.本発明は血小板が関与する一次止血の段階と血液凝固因子が関与する凝固血栓形成の段階における双方の血液凝固反応を阻害でき、医療器材又は医療材料の表面に抗血液凝固活性を保持した状態で強固に固定化できる疎水性高分子化合物を提供する。本発明は、血小板の付着を阻害する高分子化合物と、血液凝固反応を阻害する化合物とが結合している、疎水性高分子化合物を提供する。