A handheld electronic device including a first body, a second body, a linkage mechanism, and a stand is provided. The second body is slidingly disposed on the first body. The linkage mechanism is disposed between the first body and the second body. The linkage mechanism has a driven end and a drive end, wherein the driven end is driven by the first body and the second body. The stand is slidingly disposed between the first body and the second body and is driven by the drive end of the linkage mechanism. When the second body moves away the first body along an operation direction, the drive end drives the stand to move along the operation direction and the stand is exposed by the first body. The handheld electronic device then achieves a standing function through the stand.