| 摘要 |
It is to provide a large-diameter imaging lens (1) that can suppress reduction of peripheral light amount, achieve size and weight reduction, and maintain excellent optical performance. The imaging lens (1) comprises, in order from an object side to an image surface side, a first lens (2) having a positive power whose convex surface faces the image surface side, a diaphragm (3), a second lens (4) having a negative power whose convex surface faces the image surface side, a third lens (5) having a positive power, and a fourth lens (6) having a negative power, wherein conditions expressed by 0.3‰¤f/f 1 ‰¤1.7 and -2.7‰¤f/f 2 ‰¤-0.25 (where, f: focal distance of the entire lens system, f 1 : focal distance of the first lens (2), and f 2 : focal distance of the second lens (4)) are to be satisfied.
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