An antithrombotic composition comprising (i) alumina, (ii) at least one substance selected from silica and titanium oxide, and (iii) at least one element or compound selected from platinum or a platinum compound, palladium or a palladium compound, iridium or an iridium compound and rhodium or a rhodium compound, and an article such as clothing, bedding and so forth comprising the composition. The antithrombotic property can be worked by the composition or the article without lapsing into bleeding tendency.
