An inspection device includes: an acquisition unit configured to acquire dark-time image data generated in a state where the imaging element is shielded from light； a first generation unit configured to generate average added image data by adding up the dark-time image data and dividing the added-up result by number of frames； a second generation unit configured to generate difference image data in which the average added image data is subtracted from the image data； a first calculation unit configured to calculate, as a lateral streak noise index, a statistical value of the difference image data； a second calculation unit configured to calculate the lateral streak noise indices； a third calculation unit configured to calculate, as the correction value, the correlation degree having a minimum value among the lateral streak noise indices； and a recording control unit configured to record the correction value in a recording unit.
