At least one exemplary embodiment is directed to a zoom lens comprising a plurality of lens units, where the plurality of lens units have at least one negative lens including a first negative lens Gn1 arranged at a position where an effective diameter is minimized among negative lenses of the zoom lens, where when the at least one negative lens is represented by an i.sup.th negative lens Gni indicating the i.sup.th negative lens from an expansion side toward the reduction side and Xi=.theta.gFni-(0.6438-0.001682.times..nu.dni), the following condition is satisfied: (.SIGMA.Xi.times.fni)/(.SIGMA.fni)<-0.003, where the Abbe number and the partial dispersion ratio of the material of the i.sup.th negative lens Gni are .nu.dni and .theta.gFni, respectively, and the focal length of the i.sup.th negative lens Gni is fni.