Zoom lens system and optical device

Including, in order from an object side: a first lens group G1 having positive power; a second lens group G2 having negative power; a third lens group G3 having positive power; a fourth lens group G4 having negative power; and a fifth group G5 having positive power, an aperture stop being disposed to an image side of the second lens group, upon zooming from a wide-angle end state to a telephoto end state, a distance between the first lens group G1 and the second lens group G2 increasing, a distance between the second lens group G2 and the third lens group G3 decreasing, a distance between the third lens group G3 and the fourth lens group G4 varying, and a distance between the fourth lens group G4 and the fifth lens group G5 varying, and given conditionals being satisfied, thereby providing a zoom lens system having high optical performance with suppressing variation in aberrations, an optical apparatus equipped therewith, and a method for manufacturing the zoom lens system.