A sinew separating apparatus for the automatic separation of sinews and/or sinew portions present on inner breast fillets of gutted poultry bodies which have had the wings completely removed, in which both the inner breast fillet lying directly on the carcass and the outer breast fillet covering the inner breast fillet lie in their natural position, and the poultry bodies are transported, the shoulder joints forward, in transport direction T along a transport route defining the transport plane E, in which the downwardly directed breast bone is oriented in the longitudinal direction of the transport direction T and parallel to it, comprising a pair of separators for separating the sinews and/or sinew portions from the inner breast fillet, wherein the two separators are located on opposite sides of the transport route of poultry bodies to be processed, characterized in that the separators are formed as sticking knives wherein each sticking knife is designed and configured to perform at least two cutting movements in different directions of movement and the two cutting movements are superimposable is provided. Furthermore, the invention concerns a processing apparatus having such a sinew separating apparatus and a corresponding method.