A portable electronic device having a double axial antenna structure. The planar antenna used for receiving electromagnetic waves is connected to the portable electronic device capable of displaying images through a double axial connection element. In this structure, the electronic device is rotatably connected to the double axial connection element. The planar antenna is also rotatably connected to the double axial connection element, so that the planar antenna may rotate relative to the electronic device into double axial directions through the double axial connection element, as such adjusting the orientation of the planar antenna without moving the image display unit and the quality and intensity of the received electromagnetic waves.