A zoom lens consisting of: (i) a first lens unit (B1) having negative refractive power, a second lens unit (B2) having positive refractive power, and a third lens unit (B3) having negative refractive power in order from an object side to an image side (IP), or (ii) a first lens unit (B1) having negative refractive power, a second lens unit (B2) having positive refractive power, a third lens unit (B3) having negative refractive power, and a fourth lens unit (B4) in order from an object side to an image side (IP), wherein a distance between the first lens unit (B1) and the second lens unit (B2) and a distance between the second lens unit (B2) and the third lens unit (B3) is arranged to change during at least one of zooming and focusing, wherein the first lens unit (B1) is arranged to move during zooming, wherein the first lens unit (B1) includes a first negative lens (G1) disposed closest to the object side and at least one positive lens, wherein lenses included in the second lens unit (B2) all have positive refractive power, wherein there are two or fewer lenses included in the third lens unit (B3), wherein the third lens unit (B3) is arranged to move toward the image side (IP) during focusing from infinity to close range, and characterized in that the following inequalities are satisfied: 1.40 < Nd _ G 1 < 1.80 , − 1.00 ≦ SF _ B 3 n < 0.50 , and 18 < vd _ B3n < 36 , where Nd_G1 is a refractive index of the first negative lens (G1), SF_B3n is a shape factor of a negative lens having strongest negative refractive power among the third lens unit (B3) and vd_B3n is an Abbe number of the negative lens having strongest refractive power among negative lenses included in the third lens unit (B3). (i) a first lens unit (B1) having negative refractive power, a second lens unit (B2) having positive refractive power, and a third lens unit (B3) having negative refractive power in order from an object side to an image side (IP), or (ii) a first lens unit (B1) having negative refractive power, a second lens unit (B2) having positive refractive power, a third lens unit (B3) having negative refractive power, and a fourth lens unit (B4) in order from an object side to an image side (IP), wherein a distance between the first lens unit (B1) and the second lens unit (B2) and a distance between the second lens unit (B2) and the third lens unit (B3) is arranged to change during at least one of zooming and focusing, wherein the first lens unit (B1) is arranged to move during zooming, wherein the first lens unit (B1) includes a first negative lens (G1) disposed closest to the object side and at least one positive lens, wherein lenses included in the second lens unit (B2) all have positive refractive power, wherein there are two or fewer lenses included in the third lens unit (B3), wherein the third lens unit (B3) is arranged to move toward the image side (IP) during focusing from infinity to close range, and characterized in that the following inequalities are satisfied: 1.40 < Nd _ G 1 < 1.80 , − 1.00 ≦ SF _ B 3 n < 0.50 , and 18 < vd _ B3n < 36 , where Nd_G1 is a refractive index of the first negative lens (G1), SF_B3n is a shape factor of a negative lens having strongest negative refractive power among the third lens unit (B3) and vd_B3n is an Abbe number of the negative lens having strongest refractive power among negative lenses included in the third lens unit (B3). <EOS>