The incidence of incident light transmitted through a photoelectric conversion unit onto a charge holding unit, a pixel in the adjacency, and the like can be blocked in a pixel. An image sensor includes a pixel, a wiring layer, and an incident light attenuation unit. The pixel includes a photoelectric conversion unit that is formed in a semiconductor substrate and performs photoelectric conversion based on incident light, and a pixel circuit that generates an image signal according to a charge generated by the photoelectric conversion. The wiring layer is arranged on a surface of the semiconductor substrate different from a surface onto which the incident light is incident, and transports either the image signal or a signal applied to the pixel circuit. The incident light attenuation unit attenuates the incident light transmitted through the photoelectric conversion unit.