There is provided a solid-state image pickup device including a pixel area in which a plurality of pixels are arranged. The pixels include an accumulation section accumulating a charge acquired by photoelectric conversion, a plurality of detection sections detecting the charge accumulated in the accumulation section, a connection separation control section controlling connection or separation of the detection sections, an output section outputting a first signal corresponding to a potential of each detection section in a separation state in which the connection separation control section separates the detection sections, or outputting a second signal corresponding to a potential of each detection section in a connection state in which the connection separation control section connects the detection sections, and an output selection section selecting whether to output the first signal from the output section or output the second signal from the output section, based on a value of the first signal.