There is disclosed a distance measurement apparatus of a camera which obtains subject distance information (phase difference of a subject luminance signal) of each distance measurement area by a photoelectric conversion element with a plurality of distance measurement areas including a peripheral region outside a region to be photographed arranged therein, divides the distance measurement areas having numeric values in a predetermined range and being adjacent to one another into groups from the obtained subject distance information, excludes the group extending into the region to be photographed, performs distance measurement operation processing of a major subject by a distance measurement result of the group existing only in the region to be photographed, selects a result indicating a closest distance from distance measurement results, and obtains a final distance measurement output.