Abstract: A holder is adapted to be fixed on a display and adapted to hold a set-top box. The display includes a housing, and the housing includes at least one fastening portion and a first aperture. The holder includes a main body, at least one hook, and a lock component. The main body defines a holding space and has a second aperture. The holding space is adapted to contain the set-top box. The second aperture is located at one side of the holding space, and corresponds to the first aperture of the housing of the display. The hook is located at another side of the holding space for being lodged in the fastening portion. The lock component is through the second apertures and the first aperture to fix the main body of the holder on the housing of the display.