A zoom lens system includes a negative first lens group which is stationary or movable, a positive second lens group which is movable, and a positive third lens group which is movable, in this order from the object.Upon zooming from the short focal length extremity to the long focal length extremity, a distance between the negative first lens group and the positive second lens group decreases, and a distance between the positive second lens group and the positive third lens group increases.The zoom lens system satisfies the following conditions: 0.3