Focus detection device and imaging apparatus having the same

A focus detection device, in which a plurality of pixels are arranged, each pixel having a photoelectric conversion unit for converting an incident light flux into signal charges and a microlens having a focus position near the photoelectric conversion unit, comprising:

• signal lines which are used to read out signals converted from the signal charges,
• wherein the plurality of pixels include a plurality of imaging pixels for generating an image, and a plurality of focus-detecting pixels for generating an image signal for focus detection by a phase-difference focus detection method,
• wherein the signal lines comprise first signal lines and second signal lines, the first signal lines being arranged to limit incident light flux for the plurality of focus-detecting pixels in a first direction that is a predetermined pupil-divided direction, and the second signal lines being arranged to extend in a second direction that is perpendicular to the first direction,
• wherein a width of an opening, which is formed between the first signal lines, in the first direction is narrower than a width of an opening that limits incident light flux for an imaging pixel in the first direction, and
• wherein a distance between the first signal lines and the photoelectric conversion unit is shorter than a distance between the second signal lines and the photoelectric conversion unit.