© 2018 Elsevier B.V. The pulsed polarized neutron imaging technique was applied to the observation of the domain structure in a grain oriented magnetic steel sheet with an insulating coating. The spontaneous magnetization of the steel could be quantitatively evaluated from the period of the oscillatory behavior observed in the wavelength dependent polarization. In addition, a striped domain structure in the demagnetized state and the reversal of the magnetization by an external magnetic field were also confirmed by selecting the appropriate combination of the neutron spin direction for the incident and analyzed beams. The results demonstrate that this method can visualize the distribution of the magnetization in a surface-coated magnetic steel.