The present invention relates to a carbonic anhydrase, a nucleic acid molecule encoding the carbonic anhydrase, a recombinant vector including the nucleic acid molecule, a host cell transformed with the recombinant vector, and a method of preparing the carbonic anhydrase using the host cell. The carbonic anhydrase of the present invention has an excellent stability at high temperature to exhibit a carbon dioxide capturing activity even at high temperature, thereby being applied to a carbon dioxide capturing process performed at high temperature with many advantages in view of economic aspect due to mass-production of expression system.