A problem of the present invention is to provide a foldable type portable communication terminal apparatus which can have a user carried out an operation for surely guiding the user to a talkable state at the time that there was an incoming call. A hinge mechanism which coupled an upper side housing and a lower side housing in such a manner that they can be opened and closed, a push button which opens the hinge mechanism when it was depressed, light emission means which has the push button lighted up at the time of light emission, and control means which turns on the light emission means (step S4) when the hinge mechanism is closed at the time that there was an incoming call (step S2) are disposed. By this means, since the push button for opening the hinge mechanism is lighted up when a portable communication terminal apparatus was folded at the time that there was an incoming call, it becomes possible for a user to easily recognize that the user simply depress the push button for the purpose of a talk over the phone.