A solid-state imaging element includes a pixel array in which a plurality of pixels having different spectral characteristics are arranged and one or more pixels of the plurality of pixels have a spectral characteristic that includes spectral characteristics of two or more pixels that are different from the one or more pixels. The solid-state imaging element further includes a signal processing unit that synthesizes signals of one or more pixels of the pixels that have the included spectral characteristics with a luminance signal, when a signal of a pixel that has two or more spectral characteristics in the pixel array is used to generate the luminance signal.