Abstract: An information-processing device equipped with a cordless pen includes a cordless pen used for input operation and a pen storing portion for storing the cordless pen and operates: to give an alarm with a buzzer, etc., when no pen input is made and when the cordless pen is not replaced in excess of a given period of time; or to give a warning with a buzzer or the like when a cabinet of the apparatus is closed without the pen stored in the pen storage portion; or to prevent the operation of an electric power switch by means of a locking lever when the pen is not stored in place.