Zoom lens and imaging apparatus

A zoom lens consisting of:

• a first lens group having positive refractive power, and which is fixed during changing magnification and during focusing;
• a second lens group having negative refractive power, and which is moved during changing magnification;
• a third lens group having positive refractive power, and which is fixed during changing magnification and during focusing;
• a fourth lens group having positive refractive power, and which is moved during changing magnification and during focusing;
• and
• a fifth lens group having negative refractive power, and which is moved during changing magnification, which are in this order from an object side, and
• wherein a lens group constituting the first lens group consists of a front group having negative refractive power and a rear group having positive refractive power in this order from the object side, and
• wherein the second lens group consists of four lenses of a negative lens, a positive lens, a negative lens, and a positive lens arranged in this order from the object side, or consists of four lenses of a negative lens, a positive lens, a negative lens, and a negative lens arranged in this order from the object side.