As a lens type suitable for being a small size, and also suitable for a digital camera and for its smaller-sized zoom lens, in order from an object side, there is a zoom lens that has a first lens group having a negative refracting power, a second lens group having a positive refracting power, a third lens group having a positive refracting power and an aperture which is at an object side of the second lens group, moving integrally with the second lens group. When this zoom lens zooms from a wide-angle end to a telephoto end, at least the first lens group and the second lens group move, so that an interval between the first lens group and the second lens group can become small and an interval between the second lens group and the third lens group can become large. These types of zoom lenses are well-known. A zoom lens like this type has at least three positive lenses and two negative lenses in the second lens group and low dispersion glass having an Abbe's number of 80 or more is used as positive lenses of the second lens group. These types of lenses according to Japanese Patent Publication Numbers 2004-102211, 2006-113554 and 2005-24804 are known.