An imaging lens includes, from an object-side to an image-side: a first lens of positive refractive power with a convex surface on the object-side, an aperture stop, a second lens of negative refractive power with a convex surface on the image-side and a meniscus shape, a third lens of positive refractive power with a convex surface on the object-side and a meniscus shape. Specified conditions are satisfied in order to enhance a high brightness and reduce aberrations.