A portable electronic device including a first body, a second body, a sliding module, a flexible electrical member, and a first seal member is provided. The first body has a first opening. The sliding module is disposed between the first and the second bodies. The sliding module has a second opening. The flexible electrical member passes through the first and the second openings, and is connected between the first and the second bodies. The first seal member is disposed between the sliding module and the first body and surrounds the first opening.