Abstract: The invention provides an electronic thermometer in which a contact state with a human body can be confirmed by a simple, easy-to-assemble configuration. The electronic thermometer includes a hollow outer case that includes a probe unit with a temperature measuring unit, a temperature sensor, an inner case, a control circuit, and a pair of electrodes. The electrodes are positioned inside the probe unit by mounting the inner case on the outer case. A determination unit is also provided and the determination unit measures an electrostatic capacitance between the pair of electrodes and determines whether the probe unit is in proper contact with the measured region of the user based on a change of the measured electrostatic capacitance.