PURPOSE: To prevent securely errors in input and recognition by providing a touch electrode on the top surface of a transparent electrode which has a photosensor provided at the lower side, and detecting the photodetection of the photosensor when a human body touches the electrode.

CONSTITUTION: Transparent protection glass 3 which covers a liquid-crystal display device 2 is fixed to the opening part of the top surface of a timepiece case 1, the transparent electrode 4 formed on the top surface of the glass 3 is connected electrically to a circuit board 6 through an interconnector 5, and the photosensor In provided on the reverse surface of the glass 3 is connected electrically to the board 6 through the connector 5. Then, the device 2 consisting of a digital display part for displaying the time, etc., and a function display part for specifying the position of a key, etc., is connected to the board 6 through an interconnector 8 and the photodetection quantity of the sensor In is detected only when the human body touches the electrode 4.