Portable electronic device

A portable electronic device including a first body, a second body, a sensor and a third body is provided. The first body has a first display area. The second body has a second display area. A display direction of an image in the first display area and a display direction of an image in the second display area are determined based on a sensing result from the sensor. The third body has a first surface, a second surface opposite to the first surface, a first input unit disposed at the first surface and a second input unit disposed at the second surface. Two opposite ends of the second body are pivotally connected to the first body and the first surface of the third body respectively. In a first mode, the first body covers the third body, and the first display area faces the second input unit. A part of the third body is located between the first body and the second body, and the first input unit faces the second display area.