The purpose of the present invention is to provide an anti thrombotic material in which heparin or an anti thrombotic compound other than a heparin derivative is fixed to a base material elution of the compound exhibiting anti thrombotic properties from the base material is avoided and high anti thrombotic properties are maintained over a long period. The present invention provides an anti thrombotic material that includes: a covering material containing a polymer skeleton structure a 4 (aminomethyl)benzene carboxy imidamide or a benzene amidine skeleton structure and a methoxy benezene sulfonic acid amide skeleton structure； and a base material containing a surface that is covered by the covering material. The covering material is covalently bonded with the base material and a peak abundance ratio of carbonyl group derived components on the surface with respect to all the components of a C1s peak measured using X ray electron spectroscopy is equal to or greater than 1.0 atom number %.
