To manufacture polarizing glass which is less in the in-plane distribution of an extinction ratio and is uniform in directions of polarization axes.

The method for manufacturing the polarizing glass containing dispersed, stretched metal particles oriented in a uniform direction comprises; a preform preparing process for preparing a glass preform having a strip-like shape, in which particles of a metal halide are deposited; a stretching process for stretching the glass preform and the particles of the metal halide by pulling the glass preform in the longitudinal direction by a pulling means provided at the outside of heaters in the longitudinal direction of the glass preform while heating the glass preform with heaters arranged around the glass preform; and a reduction process for reducing the particles of the metal halide contained in the stretched glass stretched in the stretching process. In the stretching process, the output of the heaters is controlled so that the outer shape of a part being stretched of the glass preform contracts with an inclination angle of 5-20° to the longitudinal direction of the glass preform.