A zoom lens consisting of, sequentially from an object side: a first lens group having a positive refractive power; a second lens group having a negative refractive power; a third lens group having a positive refractive power, and a fourth lens group having a positive refractive power and disposed on an image side of the third lens group; wherein when zoom is changed from the wide angle end to the telephoto end, an interval between the third lens group and the fourth lens group decreases, wherein the second lens group is adjacent to the first and third lens groups, wherein when zoom is changed from a wide angle end to a telephoto end, an interval between the first lens group and the second lens group increases, and an interval between the second lens group and the third lens group decreases, and the second lens group comprises, sequentially from the object side, a second A lens group (G2a) having a negative refractive power and a second B lens group (G2b) having a negative refractive power, wherein the second A lens group (G2a) and the second B lens group (G2b) are arranged to move integrally when zoom is changed and the second B lens group (G2b) is arranged to be displaced in a direction perpendicular to the optical axis relative to the second A lens group (G2a) to perform a vibration prevention function; wherein the zoom lens satisfies the following conditions: 4.0 < f 1 / fw < 6.0, wherein, f1 denotes a focal length of the first lens group, and fw denotes a focal length of the zoom lens at the wide angle end characterised in that: the zoom lens satisfies the following condition: 5.0 < f 2 b / f 2 < 9.0, wherein, f2b denotes a focal length of the second B lens group (G2b), and f2 denotes a focal length of the second lens group, and the second A lens group (G2a) comprises, sequentially from the object side, a negative meniscus lens having the convex surface facing the object side, and a cemented lens (105, 106) including a negative biconcave lens and a positive biconvex lens; and the second B lens group (G2b) is configured as a cemented lens including a biconcave lens and a biconvex lens. a first lens group having a positive refractive power; a second lens group having a negative refractive power; a third lens group having a positive refractive power, and a fourth lens group having a positive refractive power and disposed on an image side of the third lens group; wherein when zoom is changed from the wide angle end to the telephoto end, an interval between the third lens group and the fourth lens group decreases, wherein the second lens group is adjacent to the first and third lens groups, wherein when zoom is changed from a wide angle end to a telephoto end, an interval between the first lens group and the second lens group increases, and an interval between the second lens group and the third lens group decreases, and the second lens group comprises, sequentially from the object side, a second A lens group (G2a) having a negative refractive power and a second B lens group (G2b) having a negative refractive power, wherein the second A lens group (G2a) and the second B lens group (G2b) are arranged to move integrally when zoom is changed and the second B lens group (G2b) is arranged to be displaced in a direction perpendicular to the optical axis relative to the second A lens group (G2a) to perform a vibration prevention function; wherein the zoom lens satisfies the following conditions: 4.0 < f 1 / fw < 6.0, wherein, f1 denotes a focal length of the first lens group, and fw denotes a focal length of the zoom lens at the wide angle end characterised in that: the zoom lens satisfies the following condition: 5.0 < f 2 b / f 2 < 9.0, wherein, f2b denotes a focal length of the second B lens group (G2b), and f2 denotes a focal length of the second lens group, and the second A lens group (G2a) comprises, sequentially from the object side, a negative meniscus lens having the convex surface facing the object side, and a cemented lens (105, 106) including a negative biconcave lens and a positive biconvex lens; and the zoom lens satisfies the following condition: 5.0 < f 2 b / f 2 < 9.0, wherein, f2b denotes a focal length of the second B lens group (G2b), and f2 denotes a focal length of the second lens group, and the second A lens group (G2a) comprises, sequentially from the object side, a negative meniscus lens having the convex surface facing the object side, and a cemented lens (105, 106) including a negative biconcave lens and a positive biconvex lens; and the second B lens group (G2b) is configured as a cemented lens including a biconcave lens and a biconvex lens.