A zoom lens includes, in order from the object side, a first lens unit having negative refractive power, a second lens unit having positive refractive power, a third lens unit having negative refractive power, and a fourth lens unit having positive refractive power. At a time of zooming from a wide-angle end to a telephoto end, the distance between the first lens unit and the second lens unit is reduced, the distance between the third lens unit and the fourth lens unit is increased, and the fourth lens unit is fixed.