Patent ID: 7535660

Claim:
An imaging lens used for forming an image of an object on an image-taking surface of a solid image sensor element, comprising: in order from an object side to an image surface side, a diaphragm, a first lens which is a meniscus lens having a positive power whose convex surface faces the object side, and a second lens which is a meniscus lens having a positive power whose convex surface faces the image surface side, wherein a condition expressed by the following expression is to be satisfied: 1.45≦( r 3 +r 4 )/( r 3 −r 4 )≦3.4 (1) where, r 3 : center radius curvature of the object side face of the second lens r 4 : center radius curvature of the image surface side face of the second lens; and wherein: conditions expressed by following expressions (7) and (8) are to be further satisfied: 0.1 ≦d 1 /fl ≦0.27 (7) 0.1 ≦d 3 /fl ≦0.27 (8) where, d 1 : center thickness of the first lens d 3 : center thickness of the second lens fl: focal distance of the entire lens system.