[The transitional object and object relations].

Within the framework of object relation theory the catalytic function of the transitional object for the process of separation and individuation is described as well as its task as a soothing object against separation anxiety. It is suggested that use and function of the transitional object are modified as the development of object constancy emerges. The psychopathological significance of the persisting transitional object is outlined. Questions yet to be answered by further research are discussed.