The invention discloses an imaging lens and an imaging device, comprising orderly from an object side: a first lens group (G1) having a positive power as a whole; a second lens group (G2) having a lens (L21) in the most object side thereof, the lens having a concave surface on the object side thereof; a third lens group (G3) made from a cemented lens comprising a lens (L31) having a positive power and a lens (L32) having a negative power; and a fourth lens group (G4) having a negative power as a whole. The second lens group (G2) has the lens (L21) which is located at the most object side thereof, which has a concave surface on the object side thereof and which configures the aperture stop (St) closer to the object side compared to the second lens group (G2), so as to meet the following conditions of: 2.0 is less than |f2/f|... (1); wherein, f represents focal length of the whole system; f2 represents focal length of the second lens group (G2); therefore, the imaging lens is capable ofmaintaining good optical performance for small size and lightweight appropriate for a vehicle camera.