The notion of the phenomenal body is provided as an alternative to Cartesian dualism. Cartesian problem consists between the objective body and the consciousness of it. How can I relate to my body? How is accounted that the body transcends at the same time as being immanent? How are accounted the experiencing body and the experienced body or the body-subject and the body-object, not separately, together? These are serious questions that later philosophers inherited from Decartes. Sartre and Merleau-Ponty tried to answer these questions by the notion of the phenomenal body. To the overcome Cartesian dualism, Sartre distinguished the body as being-for-itself and the body for others. The first consists with the body-subject, the second consists with the body-object. And both of them are mediated by the third term, "my-being-there-for-others". He adhered to his opinion that the body as being-for-itself and the body for others are belong to each different ontological dimension. This is reason for that Sartre's phenomenological strategy did not succeed and he remained in the extension of Cartesian dualism. Merleau-Ponty supposed that human being as fundamentally physical being is already always "being involved with world". We are already involved in the world before our personal reflection has not arisen. On this premise, Merleau-Ponty could explain the lived body, the body of others, the body as a subject-object. In conclusion, it is Merleau-Ponty, not Sartre that succeed in solving Cartesian problem.