PROBLEM TO BE SOLVED: To provide a contact internal thermometer capable of reducing a measurement error caused by the attitude thereof.SOLUTION: A contact internal thermometer 100 comprises: a first temperature sensor 32 thermally connected to a first probe 30 which comes into contact with a measured surface of a measuring object； a second temperature sensor 33 thermally connected to a second probe 31 which comes into contact with the measured surface of the measuring object； an environmental temperature sensor 34； and a controller 50 which calculates the internal temperature of the measuring object on the basis of the temperatures detected by the first temperature sensor 32, the second temperature sensor 33, and the environmental temperature sensor 34. When the rotation angle between at least two different measurement attitudes is &thetas；, the environmental temperature sensor 34 is arranged on the surface which passes a rotating shaft when the measurement attitude changes and forms an angle &thetas；/2 with respect to a vertical plane.【課題】接触式内部温度計において、接触式内部温度計の姿勢による測定誤差を低減する。【解決手段】測定対象物の被測定面に接触する第１のプローブ３０と熱的に結合される第１の温度センサ３２と、前記測定対象物の被測定面に接触する第２のプローブ３１と熱的に結合される第２の温度センサ３３と、環境温度センサ３４と、第１の温度センサ３２、第２の温度センサ３３及び環境温度センサ３４により検出される温度に基いて測定対象物の内部温度を算出するコントローラ５０と、を有し、少なくとも２つの異なる測定姿勢間の回転角度をθとしたとき、前記測定姿勢が変化する際の回転軸を通り鉛直面に対し角度θ／２をなす面上に環境温度センサ３４が配置された接触式内部温度計１００。【選択図】図３
