Imaging lens

There is provided an imaging lens with excellent optical characteristics while satisfying demand of low-profileness and low F-number. An imaging lens comprises, in order from an object side to an image side, a first lens with positive refractive power formed in a biconvex shape having an object-side surface and an image-side surface being convex in a paraxial region, a second lens with negative refractive power in a paraxial region, a third lens with the negative refractive power in a paraxial region, a fourth lens with the negative refractive power in a paraxial region, and a fifth lens with the positive refractive power having an image-side surface being convex in a paraxial region, and predetermined conditional expressions are satisfied.