According to one embodiment, a solid-state imaging element includes a substrate, and a plurality of color filters. A plurality of photoelectric conversion units is provided in the substrate. The plurality of color filters is provided respectively for the plurality of photoelectric conversion units. The plurality of color filters is configured to selectively transmit light of a designated wavelength band. Each of the plurality of color filters includes a stacked structure unit and a periodic structure unit. A plurality of layers having different refractive indexes is stacked in the stacked structure unit. A plurality of components is provided in the periodic structure unit at different periods according to the designated wavelength band and an incident angle of the light.