The present invention relates to a polypeptide (repebody) selectively bound to an immunoglobulin G, a polynucleotide which encodes the repebody, a vector containing the polynucleotide, a recombinant microorganism in which the polynucleotide is introduced, a method for producing the repebody using the recombinant microorganism, and a method for immobilizing or purifying an immunoglobulin G using the repebody. The repebody according to the present invention is useful as utilized for immobilization of an immunoglobulin G, purification of an immunoglobulin G, and production of an immunosensor, since the repebody selectively bound to an immunoglobulin G.