Patent ID: 7636206

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 along an optical axis, 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, and a third lens that is a biconcave lens having a negative power, wherein conditions expressed by the following expressions (1) and (2) are to be satisfied: 0.023 ≦d 4 /fl≦ 0.11 (1) 0.068 <f 1 /f 2 ≦0.8 (2) where, d 4 : distance between the second lens and the third lens on the optical axis f 1 : focal distance of the entire lens system f 1 : focal distance of the first lens f 2 : focal distance of the second lens.