To solve the problems of operability and a work space by providing a transmitter and a receiver in a mouse which is the coordinate input device of a computer and attaining a mouse incorporated type telephone set.

The mouse 1 with a built-in transmitter-receiver is provided with a shape like a transmitter-receiver to be held in a hand and is connected with a telephone set main body part 2 by an attachable and detachable cable. Also, the basic constitution of the telephone set such as a main body microphone 3, a main body speaker 4 and the respective kinds of dial buttons 5, etc., is provided. That is, by incorporating the transmitter and the receiver to the mouse provided with a mouse ball, a left button 9 and a right button 10, etc., the function of the transmitter-receiver is provided. Further, the telephone set main body part 2 is provided with a thin box shape, and by turning an upper surface to a plane, it is used as a mouse pad. Also, by turning the upper surface (mouse pad surface) of the telephone set main body part 2 to a projected curved surface provided with a gentle bulge, the fine inclination degree of the curved surface is recognized by the touch of the hand.