Image pick-up lens, image pick-up unit and mobile terminal

An image pick-up lens for forming an image of an object on a solid image pick-up element having a rectangular effective pixel area, comprising:

• a first lens having a positive refractive power and being a meniscus shape whose convex surface faces to the object side;
• a second lens having a positive refractive power and being a meniscus shape whose convex surface faces to the image side;
• a third lens having a negative refractive power and being a meniscus shape whose convex surface faces to the image side;
• and
• a diaphragm having an aperture;
• wherein the first lens, the diaphragm, the second lens and the third lens are arranged in this order from the object side and each of the first lens, the second lens and the third lens has at least one aspherical surface, and the following conditional expressions are satisfied:
• 15°<1AD<35°
• |IAh−(IAD·Yh/YD)|<5°
• where,
• YD:
• a length of ½ of the diagonal length of the rectangular effective pixel area of the solid image pick-up element,
• Yh:
• an arbitrary image height of the image pick-up lens (where, Yh<YD),
• IAD:
• an angle formed between a chief ray of a light flux forming an image at the image height YD of the image pick-up lens and the optical axis, and
• IAh:
• an angle formed between a chief ray of a light flux image forming an image at the image height Yh of the image pick-up lens, and the optical axis.