In the infrared imaging device and the method for updating the fixed pattern noise data, even if the shutter mechanism is not required and the light from all directions in the observation field does not uniformly enter the detection surface of the infrared detector, the fixed pattern Enables acquisition of noise data. For this purpose, the signal component amount calculation unit (52) calculates, for each detector element to be processed, the variance or standard deviation of a plurality of infrared detection signals detected by each detector element. Based on the dispersion or the standard deviation, the amount of the signal component depending on the infrared ray incident on the infrared detector included in the infrared detection signal is calculated. The fixed pattern noise calculation unit (53) calculates the amount of the fixed pattern noise component based on the infrared detection signal and the calculated amount of the signal component. The data updating unit (54) updates the fixed pattern noise data with the calculated amount of the fixed pattern noise component.
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