The disclosure provides a portable electronic device, including: a housing, a heat dissipation component, a bracket, a cover structure, and a plurality of pivotal linkage rods. The housing includes a heat dissipation opening. The heat dissipation component is disposed in the housing and corresponds to the heat dissipation opening. The bracket is disposed in the housing and encloses the heat dissipation component. The cover structure is configured to move between a close position covering the heat dissipation opening and an open position exposing the heat dissipation opening. Each of the plurality of pivotal linkage rods is pivotally connected between the bracket and the cover structure, and is configured to be driven to rotate, to drive the cover structure to move between the close position and the open position.