PURPOSE: To obtain the temperature measuring unit which can easily be added to the electronic calculator, by performing AD conversion with a simple method, by displaying temperature in response to the switching of a pulrality of electric circuits with the temperature change of bimetal.

CONSTITUTION: A plurality of electric circuits are switched with the temperature change of bimetal and the temperature is displayed in response to the switching. For example, the conductive terminal C is bonded at the tip of the bimetal B fixed with the fastening section A, and the temperature detecting section is formed by providing the common electrode G and a plurality of detecting electrodes S on the printed board. Further, when the temperature display key is operated. The CPU feeds the logical 1 to the common electrode G of the temperature detecting section for a given time. This signal is fed to the binary code signal lines D1WDso via the diode matrix M from the signal lines S0WS35 connected to the detecting electrode S detecting the temperature change of the bimetal B in 5° unit, and digital value of temperature is displayed on the display OUTPUT via the register SR.