Zoom lens and imaging apparatus

A zoom lens consists of, in order from the 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, a fourth lens group having a positive refractive power, and a fifth lens group having a positive refractive power,

• wherein the first lens group and the fifth lens group are fixed relative to the image plane during magnification change,
• the second lens group, the third lens group, and the fourth lens group are moved to change distances therebetween during magnification change,
• the second lens group is moved from the object side toward the image plane side during magnification change from the wide angle end to the telephoto end,
• the second lens group comprises at least one positive lens and at least four negative lenses including three negative lenses that are successively disposed from the most object side, and the second lens group and an L21 negative lens, which is the most object-side lens of the negative lenses of the second lens group, satisfy the condition expressions (1) and (2) below:
• 25<νd21<45 (1), and
• 0.31<f2/f21<0.7 (2),
• where νd21 is an Abbe number with respect to the d-line of the L21 negative lens, f2 is a focal length with respect to the d-line of the second lens group, and f21 is a focal length with respect to the d-line of the L21 negative lens.