There are arranged, in order from the object side, a first lens group having positive refractive power, a second lens group having negative refractive power, a third lens group having negative refractive power, and a fourth lens group having positive refractive power, the first and fourth lens groups being fixed whereas the second and third lens groups are moved in the axial direction to effect zooming. Further, the following conditions (1), (2) and (3) are satisfied:(1) 1.2