| 摘要 |
Disclosed is an imaging lens (1) that has a wide angle of view, a small size in the diametric direction of a lens system, and a good optical performance. An imaging lens (1) includes a first negative lens (L1) having a meniscus shape in which a concave surface faces an image side, a second negative lens (L2) having a meniscus shape in which a concave surface faces the image side and including at least one aspheric surface, a third positive lens (L3) including at least one aspheric surface, an aperture diaphragm (St), and a fourth positive lens (L4) including at least one aspheric surface, which are arranged in this order from an object side. The imaging lens satisfies the following Conditional expression 1: f �¢ 2 / f < - 4.5
(where f indicates the focal length of the entire system and f2 indicates the focal length of the second lens). |
