A body temperature measuring device includes a temperature detector including a first thermal resistor and a first pair of temperature sensors that sandwich the thermal resistor and continuously detect temperature data, and a second thermal resistor and a second pair of temperature sensors that sandwich the second thermal resistor and continuously detect temperature data. Moreover, an equilibrium state determination component determines whether the temperature detector is thermally in an equilibrium state based on detected temperature data, and a body temperature acquisition component acquires body temperature data based on temperature data detected when the temperature detector is in a thermal equilibrium state and a physical property value of the thermal resistors.
