Abstract: A slide out room for use with vehicles and other structures that use such slide out rooms to expand the interior usable space when stationary and retract such slide out rooms during travel or storage. The slide out room includes a floor, roof, main side wall and a pair of end walls, forming a room within a room. The entire assembly is movable from an extended position to a retracted position as desired. Portions of the end walls of the present invention are removable or retractable when the slide out room is retracted into the vehicle or other structure, so that the space occupied by the end walls is open, both visibly and physically, to provide greater utility for the room when retracted in without affecting its use when extended out.