A portable electronic device including a main body and a connection port is provided. The main body has a containing cavity. The connection port includes a supporting component and a connector. The supporting component is slidably disposed at the main body along a sliding direction and slides between an accommodating position and an operation position relative to the main body. The connector is disposed on the supporting component and has a plugging direction. When the supporting component is located at the accommodating position, the connector is contained in the containing cavity and the plugging direction is perpendicular to the sliding direction. When the supporting component is located at the operation position, the connector is located out of the containing cavity, and the supporting component has a tilting angle relative to the main body.