Component concentration measurement device and component concentration measurement method

A component concentration measurement device comprising:

• an irradiation section that applies measurement light to an object, the measurement light being pulsed light;
• a condenser section that condenses emitted light from the object;
• a detection section that detects light intensity;
• a gate light guide section that guides gate light, and is configured so that an optical path length can be changed, the gate light being pulsed light that is synchronized with the measurement light;
• an optical shutter section that allows light that has been condensed by the condenser section to pass through toward the detection section based on the gate light guided by the gate light guide section;
• an optical path length control section that changes the optical path length of the gate light guide section;
• and
• a calculation section that calculates a time-resolved waveform from a detection result of the detection section, and calculates a concentration of a component contained in the object.