Abstract: A computer enclosure includes a cage with a pair of brackets fixed therein for rotatably supporting a mother board tray to which a mother board is fixed. The cage includes a front panel, a rear panel, a top panel and a bottom panel forming a receiving space for receiving the mother board tray. The brackets support shafts that are rotatably received in bores defined in the mother board tray allowing the mother board to be mounted to and/or removed from the mother board tray at a position outside the cage thereby reducing the size of the cage and thus facilitating miniaturization of the computer enclosure.