Image pickup lens

An image pickup lens for forming an image of an object on a photoelectrical converter of a solid-state image pickup element, the image pickup lens comprising, in order from an object side thereof:

• an aperture stop;
• a first lens having a positive refractive power;
• a second lens having a negative refractive power and comprising a concave surface facing an image side of the image pickup lens;
• a third lens comprising an aspheric surface;
• and
• a fourth lens comprising an aspheric surface,
• wherein the image pickup lens satisfies following expressions:
• 0.30<f1/f<0.85,
• 0.2<r4/f<0.7, and
• 0 <|P3/P|<0.7,
• where f1 is a focal length of the first lens,
• r4 is a curvature radius of the surface of the second lens facing the image side,
• f is a focal length of a total system of the image pickup lens, P3 is a refractive power of the third lens, and
• P is a refractive power of the total system of the image pickup lens.