  We report a discovery of a new high redshift quasar at $z=5.96$, observed
with the FOCAS long-slit spectrograph on board the Subaru telescope. The
spectrum shows strong and broad Ly$\alpha$+NV emission lines with a sharp
discontinuity to the blue side. A Ly$\beta$+OVI emission line is also detected,
providing a consistent redshift measurement with the Ly$\alpha$+NV emission.
The QSO has an absolute magnitude of $M_{AB,1450}=-26.9$ ($H_{0}=50$km s$^{-1}$
Mpc$^{-1}$, $q_0=0.5$).
  The spectrum shows significant flux in the region 8000-8300 $\AA$ and thus
does not show a complete Gunn-Peterson trough in the redshift range 5.58 to
5.82, along the line of sight to this $z=5.96$
  QSO. Therefore the Universe was already highly ionized at $z=5.82$
