Disclosed is a hinge mechanism of portable phone having an advanced configuration, which can perform the opening operation and the rotating operation of a phone cover. The hinge mechanism comprises a housing to connect a phone body and a phone cover, which has a rotary chamber and a hinge chamber, a hinge part to open and to close he phone cover, which is disposed in the hinge chamber, and a rotary part to rotate the phone cover, which is disposed in the rotary chamber. A user can play a game or watch a motion picture using the portable phone while looking at the liquid crystal display of the phone cover, because the phone cover can be rotated.