CONTACT INTERNAL THERMOMETER

PROBLEM TO BE SOLVED: To set the amplitude of the heat flux passing through a plurality of sets of a first temperature sensor and a second temperature sensor disposed sandwiching a heat insulating material to be different easily in a contact internal thermometer.SOLUTION: A contact internal thermometer 100 comprises: a measuring surface 20 for contacting with a surface to be measured to calculate an internal temperature; a first temperature sensor laminate 33 in which a first measuring surface side temperature sensor is disposed on the measurement surface side of a first flexible print substrate and a first rear surface side temperature sensor is disposed on the rear surface side; and a controller which has at least a second temperature sensor laminate 34 in which a second measuring surface side temperature sensor is disposed on the measurement surface side of a second flexible print substrate and a second rear surface side temperature sensor is disposed on the rear surface side and calculates an internal temperature of the measuring object based on the measurement result of each temperature sensor, wherein the area of a second mounting part of the second flexible print substrate is larger than the area of a first mounting part of the first flexible print substrate.