Abstract: A portable electronic device includes a housing, a heat-dissipation component, a bracket, a door structure, a driving mechanism, and a driven linkage. The housing includes a heat-dissipation opening disposed in the housing. The bracket is disposed in the housing and surrounds the heat-dissipation component. The door structure is configured to move between a closed position covering the heat-dissipation opening and an open position exposing the heat-dissipation opening. The driving mechanism is coupled between the bracket and the door structure to drive the door structure to rotate and move. The driven linkage is coupled between the bracket and the door structure. When the door structure is driven to rotate and move, the door structure drives the driven linkage to rotate and move, so that the driven linkage and the driving mechanism jointly drive the door structure to move between the closed position and the open position.