A contact type internal temperature instrument is configured so that the magnitudes of heat fluxes passing through sets of first temperature sensors, which are disposed on both sides of a heat insulating member, and of second temperature sensors, which are disposed on both side of a heat insulating member, are differentiated between each other in a simple manner.This contact type internal temperature instrument (100) has: a measurement surface (20) which is brought into contact with the surface of an object, the temperature of which is to be measured a first temperature sensor stack body (33) which has a first measurement surface-side temperature sensor disposed on the measurement surface side thereof and which has a first back surface-side temperature sensor disposed on the back surface side thereof a second temperature sensor stack body (34) which has second measurement surface-side temperature sensor disposed on the measurement surface side thereof and which has a second back surface-side temperature sensor disposed on the back surface side thereof and a controller which, on the basis of the result of measurement by each of the temperature sensors, calculates the internal temperature of the object. The first back surface-side temperature sensor and the second back surface-side temperature sensor have different surface areas.Linvention concerne un instrument de température interne de type à contact configuré de telle sorte que les grandeurs des flux de chaleur passant à travers des ensembles de premier capteurs de température, qui sont disposés aux deux extrémités dun élément disolation thermique, et de second capteurs de température, qui sont disposés sur les deux côtés dun élément disolation thermique, sont différenciés les uns des autres de manière simple. Cet instrument de température interne de type à contact (100) possède : une surface de mesure (20) qui est amenée en contact avec la surface dun objet, la température duquel devant être mesurée un premier co
