Imaging lens, camera, and portable information terminal device

An imaging lens, comprising:

• a front lens group having positive refractive power;
• an aperture stop;
• and
• a rear lens group having positive refractive power,
• wherein the front lens group, the aperture stop, and the rear lens group are being arranged in that order from an object side to an image side,
• wherein an object-side lens closest to an object within the front lens group and an image-side lens closest to an image within the rear lens group are configured so as to form only three air lenses therebetween, each air lens being an air gap between an image-side surface of an object-side lens and an object-side surface of an image-side lens, the object-side lens and the image-side lens being adjacent to each other in an optical axis of the imaging lens, and
• wherein the three air lenses include an object-side air lens disposed closest to the object, an image-side air lens disposed closest to the image, and an intermediate air lens disposed between the object-side air lens and the image-side air lens, the object-side air lens and the image-side air lens being biconvex, and the intermediate air lens being biconcave.