Abstract: A cushioning device includes a cushioning member adapted to permit the head or the neck of a user to rest thereon, and a rear wall surface. A guiding member is disposed on the rear wall surface proximate to an upper edge thereof, and has a first end, a strapped portion, and a second end. The strapped portion has an inner frictional surface spaced apart from the rear wall surface to define a passage therebetween. A strap member includes leading and tailing ends which are detachably interconnected by a fastening member, and a flexible elongated portion interposed therebetween and insertable into the passage. When the leading and tailing ends are wrapped around an upright support so as to be pulled towards each other, the elongated portion will be brought into frictional contact with, and will be retainingly slidable relative to the inner frictional surface.