A body-borne sound sensor has already been used for the analysis of human and animal joints, wherein the sounds that arise from the friction in joints or during the formation of cracks in bones are analyzed in greater detail. In order to ensure an optimum transmission of sound to the sensor, the invention provides that between the body-borne sound sensor pressure surface (12), which is perpendicular to its measurement axis (11), and the skin there is provided a transmission wedge (15) which, as has been shown, brings about improved transmission of sound, and it is therefore possible to provide a more accurate analysis of the sound spectrum for a diagnosis of the joints and bones of humans and animals.