An imaging lens includes a first lens having positive refractive power; a second lens having negative refractive power; a third lens having positive refractive power; a fourth lens; a fifth lens; and a sixth lens, arranged in this order from an object side to an image plane side. The second lens is formed so that surfaces have positive paraxial curvature radii. The fourth lens is formed so that a surface on the image plane side has a negative paraxial curvature radius. The sixth lens is formed so that surfaces are aspherical, and the surface on the image plane side has a negative paraxial curvature radius. The first lens is arranged so that a surface on the object side is away from an image plane by a specific distance on an optical axis, and the imaging lens has a specific angle of view so that specific conditional expressions are satisfied.