Imaging lens comprising seven to nine lenses having independent resin lens sets and imaging device

An imaging lens comprising:

• seven to nine lenses inclusive having, in order from an object side, a first lens having negative refractive power, a second lens having negative refractive power, a third lens having positive refractive power, and a final lens that is arranged closest to an image surface side and has negative refractive power;
• and
• a diaphragm, wherein
• the imaging lens has resin lens sets that are independent in an object side from the diaphragm, and in an image side from the diaphragm, respectively,
• each of the resin lens sets includes a resin lens having positive refractive power and a resin lens having negative refractive power that are adjacent to each other,
• one resin lens included in each of the resin lens sets has a refractive index at line d that is smaller than 1.68 and an Abbe constant that is greater than 20 and less than 30, and
• following expressions are satisfied:
• -
• 0.5
• <
• f
• ×
• ϕ
• ⁢
• 2
• ⁢
• pf
• <
• 0.42
• (
• 1
• )
• 0.
• <
• f
• ×
• ϕ
• ⁢
• 2
• ⁢
• pb
• <
• 0.7
• (
• 2
• )
• here,
• f is a focal length of an optical system of the imaging lens,
• φ2 pf is a reciprocal of a composite focal length of two of the resin lenses of a resin lens set in an object side from the diaphragm, and
• φ2pb is a reciprocal of a composite focal length of two of the resin lenses of a resin lens set in an image surface side from the diaphragm.