An imaging apparatus comprising: a pixel array unit including a plurality of pixel groups , each of the plurality of pixel groups being one of i) a normal pixel group including only normal pixels, normal pixels not being phase difference detection pixels, or ii) a mixed pixel group including at least one normal pixel and at least one phase difference detection pixel , wherein the pixel array unit includes at least one normal pixel group and at least one mixed pixel group, for each normal pixel group, the normal pixels receive light transmitted through a same colored color filter , for each mixed pixel group, the at least one phase difference detection pixel shares an on-chip lens with at least one other phase difference detection pixel and receives light transmitted through a same colored color filter as the at least one other phase difference detection pixel , each of the plurality of pixel groups includes four pixels in a 2×2 array, for the mixed pixel groups, the four pixels include the at least one phase difference detection pixel , the at least one phase difference detection pixel includes a first phase difference detection pixel and the at least one other phase difference detection pixel includes a second phase difference detection pixel , the first phase difference detection pixel and the second phase difference detection pixel are adjacent to one another and belong to different mixed pixel groups, contacts of the normal pixels in each of the plurality of pixel groups are electrically connected to respective drive lines , which are configured to control an exposure time period for each normal pixel, and characterized in that a ttrr contact of the first phase difference detection pixel and a contact of the second phase difference detection pixel are electrically connected to the same drive line such that the first phase difference detection pixel and the second phase difference detection pixel have a same exposure time period. a pixel array unit including a plurality of pixel groups , each of the plurality of pixel groups being one of i) a normal pixel group including only normal pixels, normal pixels not being phase difference detection pixels, or ii) a mixed pixel group including at least one normal pixel and at least one phase difference detection pixel , wherein the pixel array unit includes at least one normal pixel group and at least one mixed pixel group, for each normal pixel group, the normal pixels receive light transmitted through a same colored color filter , for each mixed pixel group, the at least one phase difference detection pixel shares an on-chip lens with at least one other phase difference detection pixel and receives light transmitted through a same colored color filter as the at least one other phase difference detection pixel , each of the plurality of pixel groups includes four pixels in a 2×2 array, for the mixed pixel groups, the four pixels include the at least one phase difference detection pixel , the at least one phase difference detection pixel includes a first phase difference detection pixel and the at least one other phase difference detection pixel includes a second phase difference detection pixel , the first phase difference detection pixel and the second phase difference detection pixel are adjacent to one another and belong to different mixed pixel groups, contacts of the normal pixels in each of the plurality of pixel groups are electrically connected to respective drive lines , which are configured to control an exposure time period for each normal pixel, and characterized in that a ttrr contact of the first phase difference detection pixel and a contact of the second phase difference detection pixel are electrically connected to the same drive line such that the first phase difference detection pixel and the second phase difference detection pixel have a same exposure time period. <EOS>