An original reading lens includes a four-group, five-element lens configuration including three positive lenses and two negative lenses, wherein the positive lens is constructed by a glass material of low dispersion, and the negative lens is constructed by a glass material of high dispersion, a partial dispersion gd is defined by gd=(ng-nd)/(nF-nc) by a refractive index nd of d line (587.56 nm), a refractive index nc of c line (656.27 nm), a refractive index nF of F line (486.13 nm), and a refractive index ng of g line (435.83 nm), a straight line connecting a coordinate point of a reference glass material K7, K7 (gd, d) and a coordinate point of a reference glass material F2, F2 (gd, d) on a plane with a coordinate system including the partial dispersion gd and an Abbe number d as orthogonal two axes is adopted as a reference line, and a partial dispersion deviation gd which is the deviation from the reference line of the partial dispersion gd of the material is positive in one or more positive lens.