  We have performed $^{115}$In-NMR spectroscopy for Ni$_{2}$InSbO$_6$ with
corundum-related crystal structure to reveal magnetic structures that develop
in high magnetic fields. At low fields Ni$_{2}$InSbO$_6$ shows a helical
magnetic order with a long wavelength because of its chiral and polar crystal
structure. The field-induced magnetic state was not investigated by microscopic
experiment because an extremely high magnetic field is required to modify the
antiferromagnetically coupled helical structure. From the analysis of our
$^{115}$In-NMR spectra obtained at high magnetic fields, we confirm that the
canted antiferromagnetic structure appears in fields applied in the $[110]$
direction and the propagation vector of magnetic helix is rotated toward the
field direction for fields in the $[001]$ direction. We discuss the effect of
magnetic field that modifies the magnetic structure of an antiferromagnetic
chiral magnet.
