A zoom lens includes, in order from an object side: first to fifth lens units respectively having positive, negative, positive, positive, and positive or negative refractive powers. The first lens unit is configured not to move for zooming, and the second, third, and fourth lens units are configured to move during zooming to change an interval between adjacent lens units. An aperture stop is arranged between the second and third lens units. The second lens unit is positioned on the image side and the third lens unit is positioned on the object side at a telephoto end. Focal lengths of the zoom lens at a wide angle end and of the third and fourth lens units, lateral magnifications of a lens group consisting of the third and fourth lens units at the wide angle end and at the telephoto end are each appropriately set.