Provided are an optical lens and an imaging device including the optical lens. The optical lens sequentially includes a first lens, a second lens, a third lens, a fourth lens and a fifth lens from anobject side to an image side along the optical axis, wherein the first lens has negative refractive focal power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; the second lens has positive focal power, and the object side surface and the image side surface of the second lens are both convex surfaces; the third lenshas negative focal powder, and the image side surface of the third lens is a concave surface; the fourth lens has positive focal power, and both the object side surface and the image side surface of the fourth lens are convex surfaces; and the fifth lens has negative focal power, the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a concave surface. The optical lens can achieve at least one of the advantages such as good imaging quality, long-focus distant shooting, large angle of view, large aperture and miniaturization.