  We present the results of wide-field JHKs polarimetry toward the HII region
S106 using the IRSF (Infrared Survey Facility) telescope. Our polarimetry data
revealed an extended (up to ~ 5') polarized nebula over S106. We confirmed the
position of the illuminating source of most of the nebula as consistent with
S106 IRS4 through an analysis of polarization vectors. The bright portion of
the polarized intensity is consistent with the red wing component of the
molecular gas. Diffuse polarized intensity emission is distributed along the
north--south molecular gas lanes. We found the interaction region between the
radiation from S106 IRS4 and the dense gas. In addition, we also discovered two
small polarization nebulae, SIRN1 and SIRN2, associated with a young stellar
objects (YSO). Aperture polarimetry of point-like sources in this region was
carried out for the first time. The regional magnetic field structures were
derived using point-like source aperture polarimetry, and the magnetic field
structure position angle around the cluster region in S106 was found to be ~
120$\arcdeg$. The magnetic fields in the cluster region, however, have three
type position angles: ~ 20$\arcdeg$, ~ 80$\arcdeg$, and ~ 120$\arcdeg$. The
present magnetic field structures are consistent with results obtained by
submillimeter continuum observations. We found that the magnetic field
direction in the dense gas region is not consistent with that of the low
density gas region.
