A focus control device includes a region setting section 2010 that sets a plurality of regions, each including a plurality of pixels, to an image acquired by an imaging section 200, an AF evaluation value calculation section 2020 that calculates an AF evaluation value of each of the plurality of regions, an invalid region setting section (invalid block setting section 2050) that sets an invalid region (low contrast determination invalid block) in the plurality of regions, a low contrast state determination section 2075 that determines whether or not the target subject is in a low contrast state based on the AF evaluation value of a region, in the plurality of regions, other than the invalid region, and a focus control section 2000 that controls an in-focus object plane position based on the AF evaluation value. The focus control section 2000 is configured to implement the focus control varying depending on a determination result obtained by the low contrast state determination section 2075.