1. A camera, comprising: an imager which captures an object scene; an assigner which assigns a plurality of metering areas to said object scene; an evaluator which evaluates a luminance of said object scene for each metering area; a classifier which classifies said plurality of metering areas into a high luminance area representing a luminance higher than a first threshold value and a low luminance area representing a luminance lower than said first threshold value on the basis of a plurality of luminance evaluated values obtained by the evaluation processing by said evaluator; a detector which detects a border between said high luminance area and said low luminance area which are included in said object scene on the basis of a positional relationship between said plurality of metering areas classified by said classifier; a corrector which corrects each of said plurality of luminance evaluated values obtained by the evaluation processing by said evaluator on the basis of a size of the border detected by said detector; an adjuster which adjusts an exposure amount on said imager on the basis of the luminance evaluated values corrected by said corrector; a first calculator which calculates a width of a border area along the border detected by said detector; and a second calculator which calculates a width of said high luminance area included in said object scene on the basis of said plurality of metering areas classified by said classifier, wherein said corrector performs a correction on the basis of the width of said border area calculated by said first calculator, said first calculator calculates a width of an adjacent area adjacent to said high luminance area included in said object scene as the width of said border area out of said low luminance area, and said corrector performs a correction by noting a relationship between the width of said adjacent area calculated by said first calculator and the width of said high luminance area calculated by said second calculator.