A gas analysis system includes a gas analyzer which analyzes a gas acquired from a living body and a liquid separator which is detachably attached to the gas analyzer, and which separates a liquid component from the gas. In the gas analysis system, the liquid separator includes a magnet, and the gas analyzer includes a magnetic sensor which detects magnetism generated by the magnet, and a determining section which, based on the magnetism detected by the magnetic sensor, determines that the liquid separator is attached to the gas analyzer.
