  In order to search for high-redshift galaxies around $z \sim 6$ in the Subaru
Deep Field, we have investigated NB816-dropout galaxies where NB816 is the
narrowband filter centered at 815nm with FWHM of 12.5 nm for the Suprime-Cam on
the Subaru Telescope. Since the NB816 imaging is so deep we can detect 10
well-defined NB816-dropout galaxies that we identify to lie at $z$ = 5.8 --
6.5. We discuss their observational properties.
