Imaging lens

An imaging lens comprising:

• a first lens having negative refractive power;
• a second lens having negative refractive power;
• a third lens having positive refractive power;
• a fourth lens having negative refractive power;
• and
• a fifth lens having positive refractive power, arranged in this order from an object side to an image plane side,
• wherein said first lens is formed in a shape so that a curvature radius of a surface thereof on the image plane side is positive,
• said second lens is formed in a shape so that a surface thereof on an object side has a sharp convex surface facing the object side from an optical axis to an periphery, and a curvature radius of a surface thereof on the image plane side is positive,
• said third lens is formed in a shape so that a curvature radius of a surface thereof on the object side is positive and a curvature radius of a surface thereof on the image plane side is negative,
• said fourth lens is formed in a shape so that a curvature radius of a surface thereof on the object side is negative and a curvature radius of a surface thereof on the image plane side is positive, and
• said fifth lens is formed in a shape so that a curvature radius of a surface thereof on the object side is positive and a curvature radius of a surface thereof on the image plane side is negative, and the surface thereof on the image plane side is formed in an aspheric surface having an inflection point.