A substantially semicylindrical lens having a lensing function, a shading-correcting (reducing) function, and a predetermined-wavelength transmitting function is formed on the upper surface of a device chip including a sensor array, a CCD transfer register, a read-out gate, and the like. The substantially semicylindrical lens is semicircular in cross section along a second direction, and has a lens surface curved in a first direction so that its diameter is larger at both ends in the first direction than in the center in order to serve a function of correcting the shading caused by the optical conditions outside the device. The substantially semicylindrical lens is partially or entirely made of a substance that is transmissive with respect to a signal having a predetermined wavelength.