[Problem] To provide a non-battery, contactless body temperature measurement device (1), which makes high precision body temperature measurement possible and easily implements increased precision of body temperature measurement by software version upgrades. [Solution] A body temperature measurement device (1) configured from a body temperature-detecting unit (11) and a terminal device (10). The body temperature-detecting unit (11) is provided with a power source section (11b) for converting a voice output signal from the terminal device (10) to electric power, a detection section (11c) for detecting infrared energy from the user's skin surface as a temperature detection signal, and a conversion section (11d) for converting the temperature detection signal to a voice input signal. The terminal device (10) is provided with: a vibration means for vibrating the voice output signal to the body temperature-detecting unit (11)； and a measurement means for estimating, on the basis of the voice input signal received from the body temperature-detecting unit (11), the thermal emissivity of the user's skin surface, and the amounts of change in surface temperature over time calculated within a specified measurement period, the user's body temperature that corresponds to the surface temperature for which said amount of change is smallest.La présente invention vise à fournir un dispositif de mesure de la température corporelle sans contact et sans batterie (1), qui rende possible des mesures haute précision de la température corporelle et mette facilement en application une précision accrue de la mesure de la température corporelle par des mises à jour de la version du logiciel. La présente invention concerne par conséquent un dispositif de mesure de la température corporelle (1) configuré à partir d'une unité de détection de la température corporelle (11) et d'un dispositif terminal. L'unité de détection de la température corporelle (11) est dotée d'une section source de puissanc
