A wide-angle lens includes an object-side lens group 200, an image-forming side lens group 400, and at least one converging lens 300 arranged between the object-side lens group 200 and the image-forming side lens group 400. The object-side lens group 200 includes at least one concave lens 210 including a convex light incident surface 211 on the object side. The light incident surface 211 of the concave lens 210 is a convex aspheric surface 211a whose curvature increases from a portion adjacent to the central optical axis toward the periphery of the lens. The concave lens further includes a light emitting surface 212 which is a substantially concave spherical surface.
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