To provide an SO 3 analysis device and analysis method capable of accurately and rapidly measuring the concentration of SO 3 in exhaust gas without pre-processing. The present invention is provided with a light source (11) for radiating laser light (2) to exhaust gas (1) including SO 3 , CO 2 , and H 2 O, a photodetector (13) for receiving the laser light (2) radiated to the exhaust gas (1), a light source control unit (14a) of a control device (14) for controlling the wavelength of the laser light (2) radiated by the light source (11) so as to be 4. 060 µm to 4.192 µm, and a concentration calculation unit (14b) of the control device (14) for calculating the SO 3 concentration by infrared spectroscopy on the basis of the output from the photodetector (13) and a reference signal from the light source control unit (14a).
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