Definition of the borderline personality disorder was needed to be added at a later time to Freud?s division between neurosis and psychosis. Fundemantal properties of borderline cases such as the sensivity to the loss of the object and determination of Oedipal phase?s characteristics by this factor, ideal ego?s and ego ideal?s being dominant in the presence of a week superego, perception the object as intrusive or abandoning and the self perception?s having the same split can be assessed using projective tests. In this paper, a borderline case is aimed to be assessed in the light of the ego ideal and the ideal ego concepts. For this purpose, the patient?s responses to the Rorschach test and TAT were assessed with respect to the basic properties of the borderline personality organization and ideal ego concept. Intellectualization efforts, difficulties in expressing object relations, alienation feelings, ambivalence towards both self and object, narcissistic anxieties, conflicts related to the objects of the first years, and identification problems were identified in the tests of the patient. With only one color response given to the Rorschach test, the patient is thought to build a reaction formation to the affects that the color of the test made out. It can be said that the interpretation of the tests applied to the patient within the scope of ego ideal concept showed consistency with the concept?s definition.