Solid-state imaging element and electronic device

A solid-state imaging element is provided with a pixel array unit in which a plurality of unit pixels including a photoelectric conversion unit are arranged in a matrix; an amplifier unit which adjusts the levels of pixel signals outputted from the unit pixels through vertical signal lines provided to correspond to a column array of the pixel array unit; a sampling & holding unit which samples andholds a pixel signal passing through the amplifier unit; and an analog-digital conversion unit which converts a pixel signal outputted from the sampling & holding unit to a digital signal. The sampling & holding unit has at least three capacitances each for holding the pixel signal and concurrently performs the incorporation of the pixel signal into one capacitance, and the output of the pixel signal previously incorporated into another capacitance to the analog-digital conversion unit. 固态摄像器件设置有：像素阵列单元，在该像素阵列单元中，以矩阵形式布置包括光电转换单元的多个单位像素；放大器单元，其调节通过垂直信号线从单位像素输出的像素信号的电平，垂直信号线设置成对应于像素阵列单元的列阵列；采样保持单元，其采样和保持通过放大器单元的像素信号；和模