The present invention provides antigen-binding molecules containing (i) an antigen-binding domain whose antigen-binding activity varies depending on ion concentration conditions, (ii) an FcgammaR-binding domain having Fcgamma RIIb-selective binding activity, and (iii) an FcRn-binding domain having FcRn-binding activity under an acidic pH range condition, and methods of decreasing plasma antigen concentration as compared to before administering the molecule, which include the step of administering the molecule.