To perform suitable exposure control by using each defocus amount of a plurality of focus detection areas.

An imaging apparatus having a plurality of focus detection areas and a plurality of photometric areas obtains a defocus amount in each focus detection area and calculates a first photometric value by performing weighting based on the obtained defocus amount and a second photometric value without performing weighting based on the obtained defocus amount. A weighting coefficient is decided so that the weighting of the first photometric value is smaller based on the obtained defocus amount, and an exposure value is calculated based on the result of the weighting calculation of the first photometric value and the second photometric value.