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.【課題】接触式内部体温計において、断熱材を挟んで配置される第１の温度センサと第２の温度センサの複数の組を通過する熱流束の大きさを簡便に異なるものとする。【解決手段】本発明に係る接触式内部温度計１００は、内部温度を算出するため被測定面に接触させる測定面２０と、第１のフレキシブルプリント基板の測定面側に第１の測定面側温度センサが配置され、背面側に第１の背面側温度センサが配置される第１の温度センサ積層体３３と、第２のフレキシブルプリント基板の測定面側に第２の測定面側温度センサが配置され、背面側に第２の背面側温度センサが配置される第２の温度センサ積層体３４を少なくとも有し、各温度センサの測定結果に基づいて前記測定対象物の内部温度を算出するコントローラと、を有し、前記第１のフレキシブルプリント基板の第１の実装部分の面積よりも、前記第２のフレキシブルプリント基板の第２の実装部分の面積の方が大きい。【選択図】図３
