Patent ID: 8725444

Claim:
A thermometer comprising: a first surface temperature measurement unit that measures a first surface temperature (T 1 X) of a measurement subject; a first reference temperature measurement unit that measures a temperature as a first reference temperature (T 2 X) at a position where the temperature has a predetermined thermal resistance value between the position and the measurement position of the first surface temperature and has a first thermal resistance value between the position and the outside air; a second surface temperature measurement unit that measures a second surface temperature (T 3 X) at a surface position different from the measurement position of the first surface temperature; a second reference temperature measurement unit that measures a temperature as a second reference temperature (T 4 X) at a position where the temperature has the predetermined thermal resistance value between the position and the measurement position of the second surface temperature and has a second thermal resistance value different from the first thermal resistance value between the position and the outside air; a temperature correction unit that calculates amounting positional difference between the first and second surface temperature measurement units from the measurement subject and a mounting positional difference between the first and second reference temperature measurement units from the measurement subject in terms of temperature differences that compensate for temperature dependence, thus correcting the first surface temperature and first reference temperature, or the second surface temperature and second reference temperature; and a core temperature calculation unit that calculates a core temperature of the measurement subject using the first surface temperature and first reference temperature or the second surface temperature and second reference temperature corrected by the temperature correction unit.