Sadra’s view on immateriality of the human soul has been stood against the view considering the soul to be immaterial at the beginning of its life in this world. Presenting a bright explanation of Sadra’s on immateriality of the soul, one can attain a better understanding of material appearance and immaterial lasting of the soul, its way of being connected to human body and the way for a material to become an immaterial entity. Relying on the Sadra’s philosophical principles and their necessary ends, one may explain the how of immateriality of the soul. His view on immateriality state of being in two grades, in one hand and in the other, in the how of intellectual immateriality of the soul, differs from that of those saying immaterial occurrence of the human soul. On the basis of the essentiality of existence, unity and multiplicity have been established on existence. When the soul moves in the grades of existence in its essence, its very existence would be the same as the last grade, while the other grades before the last would be counted as its necessary states. Therefore, when the soul attains the intellectual immateriality, it does not change into intellect. In such a grade of intellectual immateriality, the soul in company with all its necessary states, being in connection with an intellectual immaterial substance, admits of such a title.