An apparatus (1) for supporting a cooling device (30) thereon includes a bracket (10) and a saddle (20) carrying the cooling device (30) thereon. The bracket (10) defines two opposing rails (12), (13) and a washboard-like member (14) extending along a direction in which the rails (12), (13) extend. The saddle (20) includes a positioning member (26) engaged in the washboard-like member (14) to position the saddle (20) to the bracket (10) and two blocks (24) slidable on the rails (12), (13) of the bracket (10) under condition that the positioning member (26) is disengaged from the washboard-like member (14).