The present invention relates to an antibody binding to a carbonic anhydrase, wherein the antibody comprises (a) the amino acid sequences SEQ ID NOS. 1 (CDR 1), 2 (CDR 2) and 3 (CDR 3) determining the CDRs of the VH region, and the amino acid sequences SEQ ID NOS. 4 (CDR 1), 5 (CDR 2) and 6 (CDR 3) determining the CDRs of the VL region； or (b) the amino acids sequences of (a), wherein at least one amino acid is conservatively substituted in any one of the amino acid sequences SEQ ID NOS. 1 to 6.
