Zoom lens and image pickup apparatus equipped with zoom lens

A zoom lens comprising, in order from an object side to an image side, a first lens unit of a positive refractive power, a second lens unit of a negative refractive power, a third lens unit of a positive refractive power, a fourth lens unit of a positive refractive power, and a fifth lens unit of a positive or negative refractive power, the second and fourth lens units being moved during zooming, a distance between the first and second lens units increasing at a telephoto end in comparison with a wide-angle end,

• wherein the fifth lens unit includes a first lens subunit of a negative refractive power, and a second lens subunit of a positive refractive power located on the image side of the first lens subunit, the first lens subunit is moved to have a component perpendicular to an optical axis to change an image-forming position, and
• wherein following condition is satisfied:
• 0.5<|(1−β5n)×β5p|<2.0,
• where β5n denotes a lateral magnification of the first lens subunit, and β5p denotes a lateral magnification of the second lens subunit.