The present invention has as an object to make available a temperature-sensor calibrating method that enables a wearable clinical thermometer to be reused by having its temperature sensor be detachable from/reattachable into its clinical-thermometer main unit, and by calibrating the temperature sensor whenever the temperature sensor is to be swapped out, making it possible to render the clinical-thermometer main unit post-multicycle-use disposable. In order to accomplish the just-stated objective, a temperature-sensor calibration method involving the present invention comprises a base-resistance acquisition step of sampling a base resistance value per a temperature sensor, fitted detachably from/reattachably onto a wireless-data-communicating wearable clinical thermometer, for sensing a target subject's body temperature and measuring the temperature, and of acquiring the base resistance value, a computation step of computing, based on the difference between the acquired base resistance value and a resistance value gauged with a standard temperature gauge, a calibration coefficient for calibrating temperature, and a storage step of storing the calibration coefficient in a measuring-device storage medium, and is characterized in that the calibration coefficient is transmitted to the clinical-thermometer main unit.
