The present invention provides a portable electronic device including a body, a first connector, a display screen, and an input module. The body has an accommodation space and a door panel capable of exposing or covering the accommodation space. The first connector is disposed in the accommodation space. The display screen is connected to the body and is capable of being closed or opened relative to the body. The input module is detachably accommodated in the accommodation space. The input module has a second connector. The second connector is configured to be electrically connected to the first connector. The input module operates in a first mode when being accommodated in the accommodation space. The input module operates in a second mode after being taken out from the accommodation space.