Rare earth adsorbent and rare earth adsorption method using the same

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A rare earth adsorbent of an embodiment has a chelidonic acid monoamide group as a ligand, and contains a functional group represented by the following general formula (1) : wherein : X is selected from hydrogen or an alkali metal; R1 is a bonding group with a simple polymer; and R2 is a functional group selected from hydrogen, an alkyl group, an alkenyl group, an alkynyl group, and an aryl group, and may be substituted by nitrogen or oxygen or contain a functional group containing the atoms in a side chain.