In a foldable portable telephone set including a lower unit (20) having a console portion (12), an upper unit (30) having a display portion (11), and a hinge portion (13) for joining the lower unit to the upper unit so as to enable to open and close them, the upper unit (30) consists of a display portion unit (32), a supporting portion unit (34), and a rotating and sliding mechanism (40). A pair of front camera portions (17a, 17b) is disposed on the upper unit so as to position up and down of the display portion when the display portion is put into the lengthwise state and to position right and left of the display portion when the display portion is put into the oblong state by rotating and sliding the display portion unit using the rotating and sliding mechanism.