An imaging device of the present invention comprises an additive combination for subjecting image data to additive combination, a gain application section for applying minus gain image data that has been subjected to additive combination by the additive combination section, an additive combination section for, at the time of imaging in the imaging section, respectively subjecting a plurality of image data, that have been acquired by divided exposure at the divided exposure time, to additive combination to create combined image data, and a gain application section for applying the minus gain to the combined image data to create taken image data.