The present disclosure relates to a filling body for reducing a volume of a pressure measurement chamber, which is to be filled with a pressure transmitting fluid, surrounding a pressure sensor. The filling body includes a recess for receiving the pressure sensor and has a free-standing base projecting into the recess on which the pressure sensor can be mounted. A filling body base supporting the filling body is provided on a side of the filling body facing away from the recess. The filling body can be mounted in an application location in such a way that the filling body base supports the otherwise free-standing filling body. The filling body base has a base surface that is smaller than a base surface of a filling body region that is adjacent to the filling body base and surrounding the recess.