  The article presents results on neutron electric dipole moment measurements
(EDM), made by ILL reactor using PNPI experimental installation. Double chamber
magnetic resonance spectrometer with prolonged holding of ultra cold neutrons
has been employed. The obtained results at 90% confidence level determine the
upper limit for EDM neutron quantity equal to $|d_n| < 5.5 \cdot 10^{-26}$ e$
\cdot$cm.
