A zoom lens includes, in order from an object side to an image side, first, second, and third lens units having negative, positive, and positive refractive power, respectively. The zoom lens performs zooming by varying distances between the lens units. The second lens unit includes a first lens subunit composed of positive and negative lens elements, and a second lens subunit arranged on the image side of the first lens subunit and composed of positive and negative lens elements. The following conditions are satisfied: .nu.1n<29, .nu.2n<30, 18<.nu.1p-.THETA.1n<35, and 26<.nu.2p-.nu.2n<35, where .nu.1p and .nu.1n respectively represent Abbe numbers of materials of the positive and negative lens elements of the first lens subunit, and .nu.2p and .nu.2n respectively represent Abbe numbers of materials of the positive and negative lens elements of the second lens subunit.