Image taking lens

An image taking lens forming an optical image on an solid-state image pickup element, the image taking lens comprising, in order from an object side thereof:

• a first lens with a positive power;
• a second lens with a negative power;
• and
• a third lens with a negative power,
• wherein the third lens comprises an image side surface in an aspheric shape such that a region around an optical axis in the aspheric shape is formed in a concave shape facing an image side of the image taking lens and a peripheral region in the aspheric shape surrounding the region around the optical axis is formed in a convex shape facing the image side of the image taking lens, and
• the image taking lens fulfills following conditional formulas:
• 0.01<f2/f3<0.29,
• 0.1<(r11+r12)/(r11−r12)<1.0,
• where f2 is a focal length of the second lens,
• f3 is a focal length of the third lens,
• r11 is a curvature radius of an object side surface of the first lens and
• r12 is a curvature radius of an image side surface of the first lens.