Magnetic fields are believed to play an important role in star formation.　We observed M42 and Mon R2　massive star forming regions using the wide-field (8' x 8')　near-infrared imaging polarimeter SIRPOL in South Africa. Magnetic　fields are mapped on the basis of dichroically polarized light from　hundreds of young stars embedded in the regions. We found "hourglass　shaped" magnetic field structure toward OMC-1 region, which is very　consistent with magnetic fields reported by using dust emission　polarimetry at sub-mm to FIR wavelengths. In the Mon R2 region, we found　"S-shaped" magnetic field structure across the massive protostar IRS 1　and IRS 2.　We will present the results of comparison of magnetic fields　at NIR with those at other wavelengths.