CAST experiment (CERN Axion Solar Telescope) is searching for the existence of solar axions. It utilizes a superconducting magnet, 10 m long and with a 9 Tesla magnetic field. Solar axions passing through the magnetic field is possible to be transformed into photons which could be detected by proper photon detectors. CAST has already improved the experimental limits by a factor of 10 and derived a limit better than the one resulting from astrophysical considerations. CAST will continue measuring up to the year 2010.