Imaging lens

An imaging lens comprising:

• a first lens group;
• and
• a second lens group, arranged in this order from an object side to an image plane side,
• wherein said first lens group includes a first lens, a second lens, and a third lens,
• said second lens group includes a fourth lens, a fifth lens having negative refractive power, and a sixth lens having negative refractive power,
• said third lens has a concave surface facing the image plane side near an optical axis thereof,
• said fourth lens has a convex surface facing the image plane side near an optical axis thereof,
• said sixth lens has a concave surface facing the object side near an optical axis thereof, and
• said fourth lens has an Abbe's number νd4 so that the following conditional expression is satisfied:
• 15<νd4<35.

An imaging lens comprising:

• a first lens group having positive refractive power;
• and
• a second lens group, arranged in this order from an object side to an image plane side,
• wherein said first lens group includes a first lens, a second lens, and a third lens,
• said second lens group includes a fourth lens, a fifth lens having negative refractive power, and a sixth lens,
• said third lens has a concave surface facing the image plane side near an optical axis thereof,
• said fourth lens has a convex surface facing the image plane side near an optical axis thereof,
• said sixth lens has a concave surface facing the object side near an optical axis thereof, and
• said fourth lens has an Abbe's number νd4 so that the following conditional expression is satisfied:
• 15<νd4<35.