A handheld electronic device including a first body, a second body, a flexible electrical connecting means and a cover is provided. The second body is slidely coupled to the first body. The flexible electrical connecting means is electrically connected between the first body and the second body and the cover is slidely coupled to the second body. The cover is located at a first position on the second body when the first body and the second body are in a stacked state. The cover shields the flexible electrical connecting means exposed due to the movement of the second body against the first body when the first body and the second body are in a spread state. Therefore, reliability and appearance of the handheld electronic device can be improved. In addition, available area on the handheld electronic device in the spread state can be increased, to provide higher design flexibility.