A portable electrical device includes a tablet computer, a base panel, two supporting arms and two connecting members. Two ends of each supporting arm are pivotally disposed at one lateral side of the tablet computer and one lateral side of the base panel. The base panel has two guiding grooves oppositely arranged on one surface thereof. One end of the connecting member is pivoted with the lateral side of the tablet computer, and the other end of the connecting member is limited and slidably disposed in one of the guiding grooves. When the other ends of both the connecting members are at one distal end of the guiding groove, the tablet computer is stacked on the base panel, and a touch-controlled display of the tablet computer can alternatively face towards or opposite to the base panel.