To make the angle of view wide, to make the lens bright, to insert various optical members such as a low-pass filter, etc., between a lens system and an image pickup element and to obtain high optical performance by specifying the ratio of the focal lengths of a front group and a rear group in which the arrangement of plural lenses is specified and a shaping factor.

This lens is constituted of the front group consisting of a positive lens and a negative lens and having negative refractive power as a whole, a diaphragm, and the rear group consisting of the negative lens, the positive lens, a negative meniscus lens whose concave surface is faced to an object side and the positive lens and having positive refractive power as a whole in order from the object side. Then, expressions -1.0<f2/f1<-0.1 and -0.4<1/SF<0.0 are satisfied. In the expressions, f1 and f2 express the focal lengths of the front group and the rear group, and SF is the shaping factor of the negative meniscus lens in the rear group and is a value obtained by an expression SF=(ra+rb)/(ra-rb). Then, ra and rb express the radius of curvature on the surfaces of the lens on the object side and an image side, respectively.