A zoom lens system includes a first lens unit, a lens unit having a
positive optical power placed on an image side of the first lens unit,
and a lens unit having a negative optical power placed on the image side
of the lens unit having a positive optical power. In the zoom lens
system, the lens unit having a negative optical power is closest to the
image side. A compact zoom lens system is obtained by adequately setting
the movement of each lens unit during zooming and the optical power of
each lens unit.