The aim of the present invention is to provide: a highly solvent- and heat-resistant carrier for adsorption that, regardless of the presence of an amide group or the like, has outstanding blood component adsorption properties and in particular inflammatory cytokine adsorption properties； and a method for producing a carrier for adsorption that can introduce a desired functional group onto the surface of a carrier and cross-link groups of aromatic rings in one step. The present invention provides a carrier for adsorption comprising at least one type of polymer compound having at least two repeating units containing aromatic rings. The aromatic rings form covalent bonds via the structure represented in general formula (I). [R
