An imaging element includes a pixel array which has a plurality of pixels arranged in a two-dimensional matrix, and a plurality of signal output terminals which are provided to correspond to the pixel columns of the pixel array and output the signals of the pixels in the pixel columns. In the plurality of signal output terminals, each predetermined number of signal output terminals is arranged as a set in the column direction of the pixel array. The sets of the predetermined number of signal output terminals are arranged in the row direction of the pixel array.