Patent ID: 7729062

Claim:
An imaging lens used for forming an image of an object on an image-taking surface of an image sensor element, comprising: in order from an object side to an image surface side, a first lens that is a meniscus lens having a positive power whose convex surface faces the object side, a diaphragm, a second lens that is a meniscus lens having a positive power whose convex surface faces the image surface side, wherein conditions expressed by the following expressions (1) and (2) are to be satisfied: 22≦( r 3 +r 4 )/( r 3 −r 4 )≦35 (1) 0.5≦ f 1 /fl≦ 1 (2) 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 f 1 : focal distance of the first lens fl: focal distance of the entire lens system.