Zoom lens and image pickup apparatus

A zoom lens comprising, in order from an object side to an image side, a first lens unit having positive refractive power that does not move during zooming, an intermediate group that has at least two lens units that move during zooming, a lens unit having positive refractive power that moves during zooming, and a final lens unit having positive refractive power that does not move during zooming,

• wherein each distance between adjacent lens units changes during zooming,
• wherein the intermediate group includes at least one lens unit having negative refractive power and including at least three lenses,
• wherein, in the lens unit having negative refractive power of the intermediate group, a lens unit V disposed closest to an object includes at least one positive lens and at least one negative lens, and a lens disposed closest to the object in the lens unit V is a negative lens, and
• wherein the following inequalities are satisfied:
• 1.930<n_nf<2.200
• 0.648<θ_pr+0.00253×v_pr<0.678
• −3.00<f1/f2<−1.15
• −2.00≤f2/fw<0.0
• where n_nf is a refractive index of a negative lens disposed closest to the object in the lens unit V, θ_pr and v_pr are a partial dispersion ratio and an Abbe number of a positive lens disposed closest to an image plane in the lens unit V, and f1 is a focal length of the first lens unit, and f2 is a focal length of the lens unit V, and fw is a focal length of the zoom lens at a wide-angle end.