In the present invention, a contact internal thermometer enables fast and continuous measurement. This contact thermometer (100) has at least: a measuring surface (20) brought into contact with the measured surface of an object to be measured a first temperature sensor stack (31) in which, on the measured surface side of a first heat resistant body is arranged a first measured surface side temperature sensor, and, on the rear surface side of the first heat resistant body is arranged a first rear surface side temperature sensor and a second temperature sensor stack (41) in which, on the measured surface side of a second heat resistant body is arranged a second measured surface side temperature sensor, and, on the rear surface side of the second heat resistant body is arranged a second rear surface side temperature sensor. The contact thermometer (100) also has a controller for calculating, on the basis of the results of the measurements of each of the temperature sensors, the internal temperature of the object to be measured, the controller having a first mode for calculating the internal temperature based on a heat conduction equation for non-steady-state conditions, and a second mode for calculating the internal temperature based on a heat conduction equation for steady-state conditions.La présente invention porte sur un thermomètre interne à contact, lequel thermomètre permet une mesure rapide et continue. Ce thermomètre à contact (100) a au moins : une surface de mesure (20) mise en contact avec la surface mesurée dun objet à mesurer un premier empilement de capteurs de température (31) dans lequel, sur le côté surface mesurée dun premier corps résistant à la chaleur, est disposé un premier capteur de température côté surface mesurée, et, sur le côté surface arrière du premier corps résistant à la chaleur, est disposé un premier capteur de température côté surface arrière et un second empilement de capteurs de température (41) dans lequel, sur le côté surface m
