| 摘要 |
An imaging lens includes negative first lens having a concave image-side surface, positive second lens having a convex object-side surface in a paraxial region, an aperture stop, and positive third lens having a convex image-side surface in the paraxial region, which are arranged in this order from an object side. The Abbe numbers of materials constituting the first lens and the third lens for d-line are greater than or equal to 40. The Abbe number of a material constituting the second lens for d-line is less than or equal to 40. When the focal length of an entire system is f, and the center thickness of the second lens is D3, and the focal length of the first lens is f1, the following formulas (1') and (2) are satisfied: 1.7<D3/f<2.9; and(1') -5.0<f1/f<-1.8.(2)
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