The methods for producing macromolecule identifying polymers according to
the present invention comprise the steps of polymerizing a starting
monomer in an aqueous solution in the presence of a macromolecule, a
crosslinking agent, and a radical polymerization initiator to produce a
polymer containing the macromolecule in its interior; and removing the
macromolecule from the polymer containing the macromolecule to thereby
produce the macromolecule identifying polymer having a molecular imprint
of the macromolecule. In this method, the crosslinker has a solubility in
water at 25.degree. C. of 100% by mass or higher.