A clinical thermometer comprises a plurality of thermal resistors, each of which has a first temperature sensor disposed on a side that comes in contact with the surface of the body to be examined, and a second temperature sensor disposed on the side opposing the side that comes in contact with the body surface, and the clinical thermometer measures the core body temperature of the body to be examined when adhered to the surface of the body to be examined. The clinical thermometer is provided with: a first thermal resistor having a prescribed thermal resistance between the first and second temperature sensors second and third thermal resistors having thermal resistances between the first and second temperature sensors lower than that of the first thermal resistor a homogenization member that covers the faces of the first to third thermal resistors at the side opposing the side that comes in contact with the body surface a selecting means for selecting either a first pair comprising the first and second thermal resistors or a second pair comprising the first and third thermal resistors, on the basis of the relationships between the temperatures of the first to third thermal resistors measured with the first temperature sensors and a calculation means that calculates the core body temperature on the basis of the results of measurements by the temperature sensors belonging to the pair selected by the selecting means.
