1. A solid-state image pickup device, comprising: a plurality of pixels, wherein each pixel includes a high-sensitivity pixel and a low-sensitivity pixel having a lower sensitivity than the high-sensitivity pixel; a low-sensitivity pixel control gate configured to control a potential of a photoelectric conversion device of the low-sensitivity pixel; and a high-sensitivity pixel control gate configured to control a potential of a photoelectric conversion device of the high-sensitivity pixel, wherein the high-sensitivity pixel control gate is set to a low level when charges are accumulated in the photoelectric conversion device of the high-sensitivity pixel and when the charges are transferred.