A zooming optical system includes a first lens group having negative refractive power, a second lens group having positive refractive power, a third lens group having negative refractive power, and a fourth lens group having positive refractive power, in that order from an object side. The first lens group has at least one cemented lens having positive refractive power. Each of the first lens group, the second lens group, the third lens group, and the fourth lens group are configured to move along a direction of an optical axis in zooming. Conditional expression (1) below is satisfied: −10.0