The essay regards the question of human nature, pointing out the concept of “poverty”, that Martin Heidegger uses to draw a new map of human essence, as for the metaphysic and bourgeois vision. It highlights the possible relationship between Heidegger and the “conservatory revolution”; but also his definite refusal of the biologic theory. Heidegger’s man – denaturalized and de-subjectivized without an ethics – is studied from 1919 to 1950 and this survey shows that the opposition to “humanismus” does not mean a heideggerian support to “inhuman.