  We present here the development status of the NIR spectrograph of the Son Of
X-Shooter (SOXS) instrument, for the ESO/NTT telescope at La Silla (Chile).
SOXS is a R~4,500 mean resolution spectrograph, with a simultaneously coverage
from about 0.35 to 2.00 micron. It will be mounted at the Nasmyth focus of the
NTT. The two UV-VIS-NIR wavelength ranges will be covered by two separated
arms. The NIR spectrograph is a fully cryogenic echelle-dispersed spectrograph,
working in the range 0.80-2.00 micron, equipped with a Hawaii H2RG IR array
from Teledyne. The whole spectrograph will be cooled down to about 150 K (but
the array at 40 K), to lower the thermal background, and equipped with a
thermal filter to block any thermal radiation above 2.0 micron. In this work,
we will show the advanced phase of integration of the NIR spectrograph.
