A solid-state image sensor is provided. The solid-state image sensor includes photoelectric conversion elements and a color filter layer disposed above the photoelectric conversion elements. The photoelectric conversion elements and the color filter layer form normal pixels and auto-focus pixels, the color filter layer that correspond to the normal pixels are divided into first color filter segments and second color filter segments, the first color filter segments are disposed on at least one side that is closer to an incident light, and the width of the first color filter segments is greater than the width of the second color filter segments.