a b s t r a c tLet k be an algebraically closed field of characteristic 0 and let Hilb G d (P N k ) be the open locus of the Hilbert scheme H ilb d (P N k ) corresponding to Gorenstein subschemes. We proved in a previous paper that Hilb G d (P N k ) is irreducible for d ≤ 9 and N ≥ 1. In the present paper we prove that Hilb G 10 (P N k ) is irreducible for each N ≥ 1, giving also a complete description of its singular locus.