A zoom lens, comprising, in order from an object side to an image side: a front lens group including at least one lens unit which is a lens unit arranged closest to the object side in the zoom lens; a positive lens unit (Lp) having a positive refractive power; an aperture stop; a negative lens unit (Ln) having a negative refractive power; and a rear lens group including at least one lens unit which is a lens unit arranged closest to the image side in the zoom lens, wherein an interval between the lens units adjacent to each other is changed during zooming, wherein a combined focal length of the front lens group is negative at a wide angle end, wherein the positive lens unit (Lp) moves toward the object side during zooming from the wide angle end to a telephoto end such that an interval between the front lens group and the positive lens unit (Lp) decreases and an interval between the positive lens unit (Lp) and the negative lens unit (Ln) increases, wherein the negative lens unit (Ln) moves toward the image side during focusing from an object at infinity to an object at short distance at a first zoom position, wherein during focusing from an object at infinity to an object at short distance at a second zoom position which is on a telephoto side of the first zoom position, the positive lens unit (Lp) moves toward the image side, and the negative lens unit (Ln) moves toward the object side, and wherein the following conditional expressions are satisfied: fa 1 ≤ 0.8 × fw + 0.2 × ft; and fa 2 > 0.2 × fw + 0.8 × ft, where fw represents a focal length of the zoom lens at the wide angle end, ft represents a focal length of the zoom lens at the telephoto end, fa1 represents a focal length of the zoom lens at the first zoom position, and fa2 represents a focal length of the zoom lens at the second zoom position. a front lens group including at least one lens unit which is a lens unit arranged closest to the object side in the zoom lens; a positive lens unit (Lp) having a positive refractive power; an aperture stop; a negative lens unit (Ln) having a negative refractive power; and a rear lens group including at least one lens unit which is a lens unit arranged closest to the image side in the zoom lens, wherein an interval between the lens units adjacent to each other is changed during zooming, wherein a combined focal length of the front lens group is negative at a wide angle end, wherein the positive lens unit (Lp) moves toward the object side during zooming from the wide angle end to a telephoto end such that an interval between the front lens group and the positive lens unit (Lp) decreases and an interval between the positive lens unit (Lp) and the negative lens unit (Ln) increases, wherein the negative lens unit (Ln) moves toward the image side during focusing from an object at infinity to an object at short distance at a first zoom position, wherein during focusing from an object at infinity to an object at short distance at a second zoom position which is on a telephoto side of the first zoom position, the positive lens unit (Lp) moves toward the image side, and the negative lens unit (Ln) moves toward the object side, and wherein the following conditional expressions are satisfied: fa 1 ≤ 0.8 × fw + 0.2 × ft; and fa 2 > 0.2 × fw + 0.8 × ft, where fw represents a focal length of the zoom lens at the wide angle end, ft represents a focal length of the zoom lens at the telephoto end, fa1 represents a focal length of the zoom lens at the first zoom position, and fa2 represents a focal length of the zoom lens at the second zoom position.