PROBLEM TO BE SOLVED: To accurately measure exhaust gas components regardless of fluctuations in atmospheric pressure around a vehicle or a test piece which is a part thereof. An exhaust gas analyzer 100 for measuring a component concentration of exhaust gas discharged from a vehicle or a part of a specimen, the exhaust gas being mixed with exhaust gas and a reaction gas to detect a phenomenon occurring at that time. The detector 4, the pressure gauge 11 for measuring the atmospheric pressure at the time of measuring the exhaust gas or the pressure at a predetermined point in the exhaust gas analyzer as the measurement pressure, and the measurement error of the exhaust gas detector 4 due to the fluctuation of the supply amount of the reaction gas, A correction unit 51 that corrects based on the measured pressure of the pressure gauge 11 is provided. [Selection diagram] Figure 2
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