An exhaust gas analyzing system comprising a plurality of exhaust gas analyzing apparatuses an analyzer calibrating system adapted to calibrate the plurality of exhaust gas analyzing apparatuses respectively provided in a plurality of test chambers, and to supply a calibration gas to the plurality of exhaust gas analyzing apparatuses from a calibration gas cylinder arranged in a cylinder chamber partitioned from the test chambers, wherein each of the plurality of exhaust gas analyzing apparatus is equipped with a plurality of analyzers to analyze an exhaust gas, and the analyzer configurations of the exhaust gas analyzing apparatuses arranged in each of the test chambers are identical to each other or include an analyzer that is partly different, the exhaust gas analyzing system further comprising: a calibration gas line (4, 4a, 4b) adapted to concurrently supply the same calibration gas to each of the identical type of analyzers, the identical type of analyzers being provided in the plurality of apparatuses, and the plurality of apparatuses being provided in the plurality of test chambers respectively; and a control unit adapted to individually determine whether or not an output value of each of the identical type of analyzers supplied with the same calibration gas is stable, wherein the control unit is configured to individually calibrate the analyzer having the output value determined to be stable and to individually stop the supply of the calibration gas to the analyzer having completed the calibration, the calibration gas line (4, 4a, 4b) comprises a plurality of branch lines respectively provided in a one-to-one correspondence with the identical type of analyzers and a plurality of on/off valves respectively provided on the plurality of branch lines, and wherein the control unit is configured to individually control the on/off valve provided on each of the branch lines to thereby stop the supply of the calibration gas to the analyzer having completed the calibration. a calibration gas line (4, 4a, 4b) adapted to concurrently supply the same calibration gas to each of the identical type of analyzers, the identical type of analyzers being provided in the plurality of apparatuses, and the plurality of apparatuses being provided in the plurality of test chambers respectively; and a control unit adapted to individually determine whether or not an output value of each of the identical type of analyzers supplied with the same calibration gas is stable, wherein the control unit is configured to individually calibrate the analyzer having the output value determined to be stable and to individually stop the supply of the calibration gas to the analyzer having completed the calibration, the calibration gas line (4, 4a, 4b) comprises a plurality of branch lines respectively provided in a one-to-one correspondence with the identical type of analyzers and a plurality of on/off valves respectively provided on the plurality of branch lines, and wherein the control unit is configured to individually control the on/off valve provided on each of the branch lines to thereby stop the supply of the calibration gas to the analyzer having completed the calibration.