To obtain an image pickup lens which is satisfactory in image formation performance and reduced in cost with simple constitution.

This image pickup lens L is a biconvex single lens having a diaphragm S on an image I side, and either of a first surface and a second surface is constituted of an aspherical surface. If refractive indexes r1 and r2 of the lenses at a using wavelength are defined respectively the radii of curvature of the first and the second surfaces, and f is defined as the focal distance of the lens, the conditional expressions n≤1.55, 1.19≤r1/f≤1.70, and 0.62≤r2/f≤0.75 are satisfied.