Patent ID: 8000039

Claim:
An imaging lens used for forming an image of an object on an image-taking surface of an solid image pickup element, consisting of: in order from an object side to an image surface side, a diaphragm, a first lens that is a 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 a condition expressed by the following expressions (1) to (3) are to be satisfied: −0.1 ≦r 1 /r 2 <0.1 (1) 0.85 ≦f 1 /FL ≦1 (2) 0.1 ≦d 3 /FL ≦0.3 (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 f 1 :focal distance of the first lens d 3 : center thickness of the second lens FL: focal distance of the entire lens system.