To provide a shape memory mat distributing body pressure, which is deformed into a shape to be fitted to the build of a user by a simple operation, secures and improves stability and safety, and is excellent in versatility.

The shape memory mat distributing body pressure includes: a mat body 4; a plurality of cells 5 which are arranged in a distributed condition at positions for receiving the body pressure of a user applied to the mat body 4 and which is extended and contracted in a direction X against the body pressure in accordance with the amount of internal fluid stored; fluid flow paths 6 connected to the respective cells 5; a hub 7 connected so as to communicate with the plurality of fluid flow paths 6; and a valve part 8 for fixing the amount of fluid storage inside the respective cells 5 in a closed state and allowing the distribution of the fluid among the cells 5 through the fluid flow paths in an open state.