Imaging device and image-recording system

An image pickup apparatus (102) comprises a pixel region (201) having a plurality of pixels that are arranged two-dimensionally, wherein the plurality of pixels a plurality of image pickup pixels and a plurality of focus detection pixels (301a, 301b; 401) include which are capable of phase difference detection ; a plurality of micro lenses which are arranged so as to correspond to respective photoelectric conversion units of the respective image pickup pixels; and a plurality of micro lenses (309; 407) which are arranged so that they each photoelectric conversion units of the respective focus detection pixels (301A, 301B; 401), respectively. When at least one of the plurality of micro-lenses (301A, 301B; 401) is projected orthogonal to the corresponding photoelectric conversion unit, there is a peak position (923) of the at least one microlens away from a center position (P5) of the at least one microlens.