Abstract: In the main body of a portable telephone apparatus, there are provided an operation section, which contains at least one option key having a communication function other than a dial key or dial function, a speaker for outputting a voice from a remote calling party, and a microphone for receiving and sending a user's voice to the remote party. A cover which allows the option key to be exposed while concealing the rest of the operation section is rotatably attached to the main body. With this construction, it is made possible for the user to operate the option key either directly or indirectly while the cover is closed. Further, it is possible to reduce the complexity of the operation when calls are received.