Patent ID: 8508862

Claim:
An image pickup lens, comprising: a four lens configuration in which a bi-concave first lens, a bi-convex second lens, a bi-concave third lens, and a positive fourth lens are disposed in this order from an object side, wherein: at least one of the first, second, third, and fourth lenses has an aspherical surface on each side, the image pickup lens satisfies Conditional Expression (1) given below when a refractive index of the second lens with respect to d-line is taken as Nd2: 1.6 <Nd 2 (1), and the image pickup lens satisfies Conditional Expression (5) given below when a focal length of the entire lens system is taken as f and a distance between the first and second lenses on an optical axis is taken as D12: 0.5 <D 12/ f < 1.5 (5).