An imaging device includes: a plurality of first absorption layers that absorb an infrared ray with a given wavelength range, and generate pixel signals of a plurality of pixels, respectively; at least one second absorption layer that absorbs an infrared ray with a wavelength range which is different from the given wavelength range of the first absorption layers, and generates a pixel signal common to the pixels; a plurality of first electrodes that take out the pixel signals from the first absorption layers, respectively; and a second electrode that takes out the pixel signal from the at least one second absorption layer.