An adsorptive body is provided which is high in water permeation and gas permeation and can adsorb, concentrate, separate and remove components present in extremely small amounts in a liquid or gas without causing the dissolution of impurities. The present invention relates to a sintered body comprising a mixture of: thermoplastic resin particles having no functional groups with adsorbability; and resin particles having functional groups with adsorbability bonded through graft polymer chains at the surface.