An electronic device including a display body, a fixed back cover, at least one movable assembly and at least one supplemented light source is provided. The fixed back cover is disposed on the display body. The moveable assembly is disposed on the display body and located beside the fixed back cover. The supplemented light source is disposed on the movable assembly and located between the movable assembly and the display body. When the movable assembly is moved or rotated from an accommodating position to an operation position, the supplemented light source moves along with the movable assembly from being hidden between the display body and the movable assembly to out of the display body so as to locate beside the display body.