| abstract |
An optical glass, wherein, in mass %, the content of P 2 O 5 is 10%-40%, the content of B 2 O 3 is 4%-20%, the content of K 2 O is 5%-10%, and the content of TiO 2 0% to 20%, Nb 2 O 5 content is 20% to 70%, and the ratio of TiO 2 content to P 2 O 5 content, that is, TiO 2 /P 2 O 5 , is 0.38 or more and less than 1.3, Nb The ratio of the 2 O 5 content to the P 2 O 5 content, that is, Nb 2 O 5 /P 2 O 5 , is 0.7 or more and 1.03 or less. |