An imaging device has a sensor chip and a signal processing chip. The sensor chip includes a pixel array in which a plurality of pixels are arranged in a 2-dimensional matrix and a data output terminal group made up of a plurality of data output terminals which output analog signals of pixels for each pixel column of the pixel array. The signal processing chip includes a data input terminal group electrically coupled to the data output terminal group, a plurality of A/D converters which convert analog signals of pixels received by the data input terminal group into digital signals for each pixel column of the pixel array, and a control unit which controls operation of the plurality of A/D converters.