Abstract: Provided is an inclination device for bedding that is portable and enables suppression of apnea and stertor when sleeping. The inclination device for bedding is provided with a rectangular inclination surface on which the human body rests, and a fluid bag that is disposed below the inclination surface and expands into a triangular column shape or the like by providing a fluid. A support part which is a long part at both ends of the inclination surface is disposed at a location where the support part is in contact with the bedding. The inclination surface can be inclined left and right by providing liquid to the liquid bag, with the support part of the inclination surface serving as the fulcrum. In particular, the following structure is preferable: by installing at least two fluid bags in a stacked state, expansion is performed in a fan shape with the fixed part of the fluid bag serving as the fulcrum.