A zoom lens includes, in order from an object side to an image side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, and a subsequent lens unit including at least two lens units. An interval between respective adjacent lens units varies for zooming. The first lens unit includes a positive lens and a negative lens. A deviation, from a standard line, of a material of a negative lens GLn, whose relative partial dispersion of a material (θgF) is the lowest of relative partial dispersions of materials of other lenses included in the first lens unit (ΔθgF1n), an Abbe number of the material of the negative lens GLn (ν1n), a focal length of the negative lens GLn (f1n), a deviation, from a standard line, of a material of a positive lens GNLp, whose relative partial dispersion of a material (θgF) is the highest of relative partial dispersions of materials of other lenses included in the first lens unit (ΔθgF1p), an Abbe number of the material of the positive lens GNLp (ν1p), a focal length of the positive lens GNLp (f1p), and a focal length of the entire zoom lens system at a telephoto end (ft) are appropriately set.