Zoom lens

An image pickup apparatus comprising:

• a zoom lens;
• and
• an image pickup element configured to detect light flux through the zoom lens,
• wherein the zoom lens includes in order from an object side to an image side:
• a first lens unit of negative refractive power;
• a second lens unit of positive refractive power;
• and
• a third lens unit of positive refractive power,
• wherein the first lens unit moves in a locus convex toward the image side and the second lens unit moves toward the object side during zooming from a wide-angle end to a telephoto end,
• wherein an object side principal point position of the first lens unit is within the first lens unit, and
• wherein a movement locus of the image side principal point position of the first lens unit during zooming from the wide-angle end to the telephoto end intersects with a movement locus of an object side principal point position of the second lens unit during zooming from the wide-angle end to the telephoto end.