A portable electronic device includes a first body, a second body, a hinge mechanism, a spring, and a cable extending from the first body to the second body. The second body is connected to the first body through the hinge mechanism. The first body has a first pillar, a second pillar, and a third pillar. The second pillar is located between the first pillar and the third pillar. The spring is disposed in the first body as corresponding to the second pillar. The cable includes a first winding segment extending through a gap between the first pillar and the second pillar, a second winding segment extending through a gap between the second pillar and the spring, and a third winding segment extending through a gap between the second pillar and the third pillar. Two ends of the spring are respectively connected to the first body and the second winding segment.