Patent ID: 7995294

Claim:
An imaging lens used for forming an image of an object on an image-taking surface of an image sensor element, including: in order from an object side to an image surface side, a diaphragm, a first lens that is a meniscus lens having a positive power whose convex surface faces the object side, and a second lens that is a lens having a negative power whose concave surface faces the object side, wherein conditions expressed by the following expressions (1) to (3) are to be satisfied: 0.25 <r 1 /r 2 ≦0.45 (1) 0.35 ≦r 1 /FL ≦0.42 (2) 0.85 ≦f 1 /FL ≦1 (3) where, r 1 : center radius curvature of the object side face of the first lens r 2 : center radius curvature of the image surface side face of the first lens FL: focal distance of the entire lens system f 1 : focal distance of the first lens.