A portable electronic device includes a main body and a touch pen. The main body includes a first surface and a second surface opposite to the first surface. One or more accessories, such as a display and/or camera can be positioned on the first surface. A touch pen includes a support pole and a pivot portion formed on an end of the support pole. The main body defines a sliding groove in the second surface. The pivot portion slidably engages in the sliding groove. When the pivot portion slides to an end of the sliding groove, the main body is capable of being support by the touch pen.