| 摘要 |
It is to provide an imaging lens that can improve optical performance while reducing size and weight. An imaging lens includes, in order from an object side to an image surface side, a diaphragm, a first lens 3 that is a meniscus lens having a positive power whose convex surface faces the object side, and a second lens 4 that is a lens having a negative power whose concave surface faces the object side, wherein conditions expressed by the following expressions are to be satisfied: 0.25<r1/r2≦̸0.45, 0.35≦̸r1/FL≦̸0.42, and 0.85≦̸f1/FL≦̸1 (where, r1: center radius curvature of the object side face of the first lens, r2: center radius curvature of the image surface side face of the first lens, FL: focal distance of the entire lens system, and f1: focal distance of the first lens).
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