Abstract: A miniature basketball backboard assembly which attaches to a door frame or the like for indoor use and specifically for use in areas with space limitations preventing play of the full scale game. A horizontal transom brace includes a flange portion which extends horizontally over the ledge of a transom, and is fixedly attached to the transom by tacks which are nailed through holes in the transom flange and into the transom. A transom backing extends downward from the transom flange between the backboard and the transom. The backboard is attached to the transom backing by nylon screws which are placed through holes in the backboard and into threaded holes in the transom backing. The nylon backing both protects the door frame structure and improves the sturdiness and durability of the mounted backboard. A second brace (jamb brace) includes a jamb flange which extends vertically and is placed against the side edge of a jamb.