A polymer carrier to which a prescribed zinc complex group is binding directly or through a spacer, having property to bond, under a certain condition, to an anionic substituent (a phosphate group, for example), showing low solubility to a solvent (preferably insolubility to a solvent) as a whole, and being capable of capturing, separating and purifying easily a substance having an anionic substituent (a phosphate group, for example).