A zoom lens comprising in order from an object side to an image side thereof: a first lens unit (L 1) having a positive refractive power and configured not to move for zooming; a second lens unit having a negative refractive power and configured to move for zooming; a third lens unit having a negative refractive power and configured to move for zooming; an intermediate lens group including at least one lens unit and configured to move for zooming; and a rear lens group including at least one lens unit, wherein the zoom lens comprises an aperture stop placed on the object side with respect to the rear lens group or placed in the rear lens group, wherein the rear lens group includes a lens unit being closest to the object side in the rear lens group, being not on the object side with respect to the aperture stop, and configured not to move for zooming, and wherein a distance between each pair of adjacent ones of the lens units changes for zooming; characterized in that the zoom lens satisfies conditional expressions 1.3 < L2max/L2w < 3.0, 0.8 < L2max/L2t < 4.0, − 7.99 ≤ f1 × f2 + f3 / f2 × f3 ≤ − 4.91, and 0.1 < f2/f3 < 6.0, where L2w is a distance between the second lens unit and the third lens unit at a wide angle end, L2t is a distance between the second lens unit and the third lens unit at a telephoto end, and L2max is a maximum distance between the second lens unit and the third lens unit in a zoom range from a focal length ftm1 to a focal length ftm2, ftm1 and ftm2 being respectively defined as ftm1 = fw × Z 0.7, and ftm2 = fw × Z 0.9, where fw is a focal length of the zoom lens at the wide angle end, and Z is a zoom ratio of the zoom lens, and f1, f2 and f3 are focal lengths of the first, second and third lens units, respectively. a first lens unit (L 1) having a positive refractive power and configured not to move for zooming; a second lens unit having a negative refractive power and configured to move for zooming; a third lens unit having a negative refractive power and configured to move for zooming; an intermediate lens group including at least one lens unit and configured to move for zooming; and a rear lens group including at least one lens unit, wherein the zoom lens comprises an aperture stop placed on the object side with respect to the rear lens group or placed in the rear lens group, wherein the rear lens group includes a lens unit being closest to the object side in the rear lens group, being not on the object side with respect to the aperture stop, and configured not to move for zooming, and wherein a distance between each pair of adjacent ones of the lens units changes for zooming; characterized in that the zoom lens satisfies conditional expressions 1.3 < L2max/L2w < 3.0, 0.8 < L2max/L2t < 4.0, − 7.99 ≤ f1 × f2 + f3 / f2 × f3 ≤ − 4.91, and 0.1 < f2/f3 < 6.0, where L2w is a distance between the second lens unit and the third lens unit at a wide angle end, L2t is a distance between the second lens unit and the third lens unit at a telephoto end, and L2max is a maximum distance between the second lens unit and the third lens unit in a zoom range from a focal length ftm1 to a focal length ftm2, ftm1 and ftm2 being respectively defined as ftm1 = fw × Z 0.7, and ftm2 = fw × Z 0.9, where fw is a focal length of the zoom lens at the wide angle end, and Z is a zoom ratio of the zoom lens, and f1, f2 and f3 are focal lengths of the first, second and third lens units, respectively. where L2w is a distance between the second lens unit and the third lens unit at a wide angle end, L2t is a distance between the second lens unit and the third lens unit at a telephoto end, and L2max is a maximum distance between the second lens unit and the third lens unit in a zoom range from a focal length ftm1 to a focal length ftm2, ftm1 and ftm2 being respectively defined as ftm1 = fw × Z 0.7, and ftm2 = fw × Z 0.9, where fw is a focal length of the zoom lens at the wide angle end, and Z is a zoom ratio of the zoom lens, and f1, f2 and f3 are focal lengths of the first, second and third lens units, respectively.