A feature extracting element including: a light-receiving substrate where a plurality of light-receiving elements for photoelectrically converting received light are two-dimensionally arrayed; and one or more other substrates that are laminated on the light-receiving substrate, wherein the other substrate has: a convolution processor which has a plurality of multiplying circuits that are correspondingly provided per the light-receiving element or per a block that is configured of a plurality of the light-receiving elements, and performs convolution operation on signals that are output from the plurality of light-receiving elements using the plurality of multiplying circuits; a pooling processing unit to sample a signal that is output from the convolution processor, based on a predetermined condition; and a connection wiring to pass the sampled signal to the plurality of multiplying circuits.