A housing structure includes a casing unit for connection with a selected one of first and second display panels and defining a receiving space for receiving an electronic component module used for connecting electrically with one of the first and second display panels, and two side frames respectively connected to left and right sides of the casing unit at different height positions. When the casing unit and the side frames are connected to one of the first and second display panels, a third fastening hole set of each side frame is adapted to be aligned with a first or second fastening hole set of the first or second display panel so that the side frames can be connected to the selected one of the first and second display panels, thereby reducing the cost of making molds for the housing structure.