Concentration measurement device

A concentration measurement device comprising:

• a sensor configured to measure a concentration of a measurement target gas in a mixture of gases on the basis of thermal conductivity of the measurement target gas, the mixture of gases including two or more components;
• and
• a heating unit configured to heat the mixture of gases so that the concentration of the measurement target gas can be uniquely determined with respect to the thermal conductivity,
• wherein:
• the sensor includes a pair of thermoelectromotive devices in which electromotive force according to temperature is generated and a heating unit that is placed between the pair of thermoelectromotive devices and that generates heat according to an applied voltage, and measures a flow rate of the mixture of gases according to the electromotive force generated in the pair of thermoelectromotive devices heated by the heating unit,
• the concentration measurement device further includes a controller configured to control a voltage applied to the heating unit, and
• the controller applies, to the heating unit, a second voltage higher than a first voltage that is applied when measuring a flow rate of the mixture of gases, and causes the sensor to measure a concentration of the measurement target gas.