We have obtained a violet-sensitive photocell as a part of the developing project on such type of solar cell. The photocell has the structure of SnO2-SiO2-Si MOS coupled on Si n-p homojuction. It is not relevant to use as a solar cell because of its small photovoltaic power(0.25V, 150$mutextrm{A}$), however, since the spectral response of the cell is shifted toward the violet band region and its switching speed is fairly high in comparison with those of the Si p-n homojunction type solar cell, it is expected that we will be able to find mere novel utilities than the ordinary silicon photocell.