An imaging device that generates, in a pixel, a potential higher than a potential to be supplied to the pixel is provided. The imaging device includes a pixel including a first circuit and a second circuit; the second circuit includes a photoelectric conversion device; the first circuit is electrically connected to the second circuit; the first circuit has a function of adding a first potential and a second potential to generate a third potential; and the second circuit has a function of generating data in the photoelectric conversion device to which the third potential is applied and has a function of outputting the data.