First display (4) comprising a liquid crystal display is provided on the outer surface of the first case body (1). In the near proximity of the first display (4) are provided a call start button (5a), a call release button (5b), a clear button (6), and a so-called navigation key (7) comprising arrow keys for scrolling in four directions and a center key for selecting and determining target information. When the folding portable telephone apparatus according to the invention is used as a pocket game machine, the call start button (5a) is used as a so-called B button for a pocket game, the call release button (5b) as a so-called start (S) button, and the clear button as a so-called A button. On the inner surface of the first case body is provided the second display (8), on the side of which is provided an antenna (9) retractable slantwise.