A reshaped human anti-HM1.24 antibody comprising: (A) L chains each comprising (1) a constant region of a human L chain, and (2) FRs of a human L chain, and CDRs of L chain of mouse anti-HM1.24 monoclonal antibody; and (B) H chains each comprising (2) a constant region of a human H chain, and (2) FRs of a human H chain, and CDRs of H chain of mouse anti-HM1.24 monoclonal antibody. Since the majority of the reshaped human antibody is derived from human antibody and the CDR has a low antigenicity, the reshaped human antibody of the present invention has low antigenicity and therefore is very promising in medical and therapeutic applications.