Disclosed is a method for producing a glass, wherein a
molten glass is obtained by melting and refining a glass starting material and the
molten glass is molded, thereby producing a glass molded body composed of an
optical glass. The method for producing a glass is characterized by comprising preparation of a glass starting material so as to obtain an
oxide glass which contains, in cationic percent, 12-65% of B3+, 0-20% of Si4+, 0-6% of Ge4+, 15-50% of La3+, Gd3+, Y3+, Yb3+, Sc3+ and Lu3+ in total, 4-54% of Ta5+, Zr4+, Ti4+, Nb5+, W6+ and Bi3+ in total, 0-35% of Zn2+, 0-9% of Li+, Na+ and K+ in total and 0-15% of Mg2+, Ca2+, Sr2+ and Ba2+ in total, with the sum of all cationic components being 99-100%. The method is also characterized in that the glass starting material contains a
carbonate and a
sulfate.