ZOOM LENS AND IMAGING APPARATUS

To provide a zoom lens which is advantageous in terms of high optical performance in, for example, a wide angle of view, high zoom ratio, small size, and an entire zoom region.SOLUTION: A zoom lens is composed of a first lens group (B1) of positive refractive power, a second lens group (B2) of negative refractive power, a third lens group (B3) of positive refractive power, and rear groups (B4, B5, B6) in this order from an object side to an image side. The first lens group has a negative lens (B11), a positive lens (B12), and a positive lens (B13) in this order from the object side to the image side. The rear groups have a rn lens group (B4) of negative refractive index, where gaps of adjacent lens groups change for zooming, and lateral magnifications β2t, β2w of the second lens group at a telephoto end and a wide angle end, lateral magnifications β3t, β3w of the third lens group at the telephoto end and the wide angle end, an entire optical length TDt of the zoom lens, focal length ft, fw of the zoom lens at the telephoto end and the wide angle end, and focal length f1 of the first lens group satisfy a prescribed conditional expression.SELECTED DRAWING: Figure 1 【課題】例えば、広画角、高ズーム比、小型、ズーム全域にわたる高い光学性能の点で有利なズ－ムレンズを提供する。【解決手段】物体側から像側へ順に、正の屈折力の第１レンズ群（Ｂ１）と負の屈折力の第２レンズ群（Ｂ２）と正の屈折力の第３レンズ群（Ｂ３）と後群（Ｂ４、Ｂ５、Ｂ６）とからなるズームレンズであって、第１レンズ群は、物体側から像側へ順に、負レンズ（Ｂ１１）と正レンズ（Ｂ１２）と正レンズ（Ｂ１３）とを有し、後群は負の屈折率のｒｎレンズ群（Ｂ４）を有し、ズーミングのために、隣り合うレンズ群の間隔は変化し、望遠端および広角端での第２レンズ群の横倍率β２ｔ、β２ｗ、望遠端および広角端での第３レンズ群の横倍率β３ｔ、β３ｗ、ズームレンズの光学全長ＴＤｔ、望遠端および広角端でのズームレンズの焦点距離ｆｔ、ｆｗ、第１レンズ群の焦点距離ｆ１は、所定の条件式を満足する。【選択図】図１