A method of manufacturing the polarizing glass article including elongated metal particles dispersed and oriented therein comprise; a preparing process in which a mother glass including metal ions is prepared; a reducing process in which the mother glass is heated at the lower temperature than the glass transition point temperature to be reduced at least a part of the metal ions for enough time to turn the metal ions into metal particles; a precipitating process in which the mother glass after the reducing process is heated at the higher temperature than the glass transition point temperature so that metal particles are precipitated; and an elongating process in which the mother glass after the precipitating process is heated and elongated.