Abstract: A new and improved sissy bar for a motorcycle which has a movable portion so that a single rider on the motorcycle can use it as a conventional sissy bar or can position it immediately behind him for use as a backrest. If the rider has a passenger, he can position it for the comfort of the passenger. Preferably the slidable portion of the sissy bar is slidably mounted on a support bar which is attached to the frame of the motorcycle. When used as a backrest, it is slidably positioned relative to the seat to the position that the operator desires, and locked into place. A variation also permits the operator to adjust the tilt for maximum comfort. The device is simply constructed and easy to operate with a minimum of moving parts.