In a sensing device that retains a code indicating access destinations, a data amount of the code is reduced. In a pixel array unit, a plurality of areas each include a predetermined number of pixels are arrayed. A reference access code retention unit retains a reference access code for designating, as access destinations, some of the pixels in a specific area among the plurality of areas. A non-reference access code generation unit generates a non-reference access code for designating, as access destinations, the pixels in an area which does not correspond to the specific areas among the plurality of areas from the reference access code. A signal processing unit generates pixel data of pixels designated with the reference access code and the non-reference access code.