Provided is a low-dispersion optical glass that is formed of a fluorophosphate glass in which the molar ratio of the content of O2− to the content of P5+, O2−/P5+, is 3.5 or more and that has an Abbe's number (νd) of over 70 or has an F− content of 65 anionic % or more, and the optical glass enables the suppression of the volatilization of a glass component when an optical glass formed of a fluorophosphate glass is produced or when an obtained glass in a molten state is caused to flow out to shape it into a glass shaped material, so that the variation of properties such as a refractive index, etc., involved in the fluctuations of a glass composition and the variation of quality such as the occurrence of striae can be suppressed.