At least one exemplary embodiment is directed to a zoom lens which includes, in order from the object side to the image side, a first lens unit having a negative refractive power, a second lens unit having a negative refractive power, a stop, a third lens unit having a positive refractive power, and a fourth lens unit having a positive refractive power. The distance between the first lens unit and the second lens unit changes during zooming. At least one of the second, third, and fourth lens units moves so that the distance between the second lens unit and the third lens unit at the telephoto end is smaller than that at the wide-angle end and so that the distance between the third lens unit and the fourth lens unit at the telephoto end is larger than that at the wide-angle end. The distance between the stop and the third lens unit changes during zooming.