The invention relates to polypeptides consisting of amino acid sequences represented by the following formulas 1 to 4, which have binding activity to an Fc region of immunoglobulin G and can be favorably used in detecting, purifying, immobilizing or removing an antibody, immunoglobulin G or a protein containing an Fc region of immunoglobulin G,
Y-D-P-x-T-G-T-W-R-S-x-[IL] (1)
R-[QRS]-x-x-[GS]-Y-D-P-R-T-G-T-W-R-S-S-I-A-Y-G-G
G-V-V-R-Q-W-S-G-x-x-x-x-x-x-x-x-R-S-S-I-A-Y-G-G
D-A-A-W-H-L-G-E-L-V-W-A-T-Y-Y-D-P-E-T-G-T-W-x-P-D-
where x represents any amino acid residue; and amino acid residues within the square brackets indicate that any one of the amino acid residues is selected.