An apparatus for removably mounting a chair assembly to a rigid support surface such as an arena floor. The apparatus essentially comprises a base, a plurality of seat support members, a plurality of alignment members, removable securing means and unlocking means. The seat support members are attached to and extend upward from the base. The top parts of the seat support members attach to a seat member. The alignment members extend downward from opposite sides of the base and fit into openings in a rigid support surface, such as the floor of an arena. They ensure that the chair is properly aligned when installed. The removable securing means fits through an opening in the center of the base. Placing the removable securing means through an opening in the base and engaging it into an opening in the floor secures the detachable arena chair to the rigid support surface. The removable securing means is designed to be only engaged and disengaged with the unlocking means.