To provide a thermoanalyzer which can prevent an unnecessary measurement from being performed in a state that a cooling operation cannot be performed by a method wherein a measurement is finished automatically when liquefied nitrogen is consumed during a cooling measurement by using the liquefied nitrogen in such a way that a cooling operation required for the measurement cannot be performed.

A measuring and processing device 13 which controls a measurement is provided. A liquefied-nitrogen-amount setting device 14 which sets a measurement-finish liquefied nitrogen amount is provided. A comparator 15 by which the measurement-finish liquefied nitrogen amount is compared with a liquefied nitrogen amount inside a liquefied-nitrogen tank 5 is provided. The comparator 15 is constituted in such a way that it outputs, to the measuring and processing device 13, an operating signal which instructs a measurement finish when the liquefied nitrogen amount inside the liquefied-nitrogen tank 5 becomes smaller than the measurement-finish liquefied nitrogen nitrogen amount. The measuring and processing device 13 is constituted in such a way that it finishes a measurement immediately when it receives a measurement finish signal from the comparator 15.