A compact zoom lens system allowing excellent image quality regardless of an object distance, is disclosed. The disclosed zoom lens system comprises, in order from an object side to an image side, a first, a second, and a third lens units having a positive, a positive, and a negative optical powers, respectively. The spacings between the first and second lens units and between the second and third lens units are changed during zooming. The second lens unit is constituted by, in order from the object to image side, a first lens subunit having a positive or negative optical power and a second lens subunit having a positive optical power. At least the second lens subunit is moved toward the object side to change the spacing between the first and second lens subunits during focusing on an object at a short distance from an object at infinity at least one zoom position.