The purpose of the present invention is to provide a superior protein with more decreased binding property to the Fc region of immunoglobulin and/or more decreased binding property to the Fab region thereof in the weakly acidic region in comparison with a protein containing an extracellular domain of a wild-type protein G without spoiling the high antibody binding property in the neutral region, and to allow the antibody to be easily captured and recovered without denaturing it by means of a capturing agent and column comprising the above protein.The present invention relates to a capturing agent for an antibody, immunoglobulin G or a protein comprising an Fc region of the immunoglobulin G, wherein a protein consisting of a tandem-type multimer of extracellular domain mutants that have binding property to the protein comprising the Fc region of the immunoglobulin G is immobilized to a water-insoluble solid support via mainly an amino group, and a column for a chromatography for separating and purifying the protein, which is filled with the capturing agent.