The purpose of the present invention is to provide a medical material using a nickel titanium alloy which reduces the thickness of a polymer electrolyte while supporting an antithrombotic compound in an amount sufficient to create a therapeutic effect. The present invention provides a medical material wherein a nickel titanium alloy has a porous surface and allows a polymer electrolyte to infiltrate the pores, thereby reducing the thickness of the polymer electrolyte exposed at the surface of the nickel titanium alloy and supporting a sufficient amount of an antithrombotic compound as a result of the contribution of the infiltrated polymer electrolyte.
