Adsorbent for recovering useful rare metals by adsorption

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An adsorbent for recovering useful rare metals in solution by adsorption is synthesized by forming reactive sites on a polymeric base material at first, then polymerizing reactive monomers at the reactive sites of the polymeric base material by graft polymerization, thereby forming graft chains, and introducing chelate-forming groups into the graft chains, where the polymeric base material is made of woven fabrics, non-woven fabrics, films, hollow filament films (hollow fibes) or threads of polyolefinic material such as polyethylene, polypropylene or the like, and the reactive monomers are preferably vinyl reactive monomers or vinyl reactive monomers having chelate-forming groups.