A method of producing an electronic clinical thermometer is disclosed, the electronic clinical thermometer including a temperature-sensitive element, lead wire that is connected to the temperature-sensitive element, a body case having a probe part in which an insertion path for the lead wire to be inserted is formed, and a sensor cap having a cavity one end of which is opened and the other end is closed, both the lead wire projecting from the insertion path and the temperature-sensitive element being stored within the sensor cap, and the method includes a step for mounting the sensor cap on the probe part, in a state where the lead wire having the temperature-sensitive element mounted on the tip thereof projects from the insertion path of the probe part.