PURPOSE: To reduce the noises of a photosensor element by forming a ring- shaped light-shielding layer onto a transparent substrate and shaping a photosensor section into a central region surrounded by the light-shielding layer.

CONSTITUTION: A ring-shaped light-shielding layer 102 consisting of polycrystalline silicon, etc., a photosensor lower electrode 103 being formed into a central region surrounded by the layer 102 and composed of. ITO, etc., a photosensor layer 104 being shaped onto the electrode 103 and made up of amorphous Si, etc., and a photosensor upper electrode 105 consisting of Al, etc., onto the layer 104 are formed onto a transparent insulating substrate 101 composed of glass, etc. Beams B projected obliquely to the lower-side substrate face of the transparent insulating substrate 101 are reflected by the edge section A of the transparent insulating substrate 101, but the reflected beams are interrupted by the light-shielding layer 102, and do not reach the sensor layer 104. Accordingly, the noises of a photo sensor element can be reduced.