The invention far infrared relates to a camera lens unit for, provided that the object the first lens to the image plane direction from the side of the second lens and a filter, and the first lens is of the surface which faces the object side, a convex meniscus shape in the has a positive refractive power and both sides are formed aspherical, the second lens has the surface which is opposite to the first lens convex the MAIN varnish positive refractive power in the coarse form and both sides are formed into an aspheric surface, the filter filters the far-infrared sikimyeo transmitted by the first lens and the second lens is 2.0 <n110 <3.0, 2.0 <n210 <3.0, 20 <v1 <200, 20 <v2 <200, f1> f2, 1 <f2 / f <1.6, 1 < f1 / f2 <satisfies the conditions of 2.5, v1 = (n110-1) / (n108-n112), v2 = (n210-1) / (n208-n212) and, n110 is the wavelength of the first lens 10㎛ the refractive index and, n108 is a refractive index of the first lens at a wavelength of 8㎛, n112 is the refractive index at a wavelength 12㎛ of the first lens, and n210 is the refractive index at the wavelength of the second lens 10㎛, n208 is the second a refractive index of the lens at a wavelength of 8㎛, n212 is a refractive index in the second wavelength 12㎛ the lens, f is the combined focal length of the first and second lens at a reference wavelength 10㎛, f1 is the reference wavelength 10㎛ and the focal length of the first lens in, f2 is a focal length of the second lens at a reference wavelength 10㎛. According to such a far-infrared lens unit for a camera, the structure 2 by a lens of a simple sheet, yet may provide the desired performance, it can be molded by a molding provides an easily manufacturing advantages.