A focus control device comprising: an acquisition unit configured to acquire image data of a plurality of first frames of an image acquisition area, each of the plurality of first frames being captured at each of positions of a lens in an optical axis direction, the positions being different from each other, wherein the image acquisition is an area of a frame captured by an image sensor; a central processing unit configured to analyse contrast evaluation values in an area to be focused on, which is a partial area of the image acquisition area, and to detect a peak of the contrast evaluation values, such that a focusing position of the lens can be detected; and a movement unit that, when a focusing position of the lens is not detected in the area to be focused on in the plurality of first frames because a peak of the contrast evaluation values is not detected, is configured to determine a direction for moving the area to be focused on, based on a magnitude of a contrast evaluation value within the area to be focused on and a position of an area with the contrast evaluation value larger than or equal to a given threshold in each piece of image data of the plurality of first frames or a plurality of second frames newly acquired by the acquisition unit, and to move the area to be focused on in the determined direction; an outdoor determination unit that, when the peak of the contrast evaluation is not detected by the central processing unit and the direction for moving the area to be focused on is not determined by the movement unit, is configured to determine whether or not image data of the area to be focused on is outdoor image data; wherein, when the outdoor determination unit determines that the image data of the area to be focused on is outdoor image data, the movement unit is configured to move a position of the area to be focused on in a gravitational acceleration direction of a subject being imaged; and wherein, when the outdoor determination unit determines that the image data of the area to be focused on is not outdoor image data, the movement unit is configured to increase an area of the area to be focused on. an acquisition unit configured to acquire image data of a plurality of first frames of an image acquisition area, each of the plurality of first frames being captured at each of positions of a lens in an optical axis direction, the positions being different from each other, wherein the image acquisition is an area of a frame captured by an image sensor; a central processing unit configured to analyse contrast evaluation values in an area to be focused on, which is a partial area of the image acquisition area, and to detect a peak of the contrast evaluation values, such that a focusing position of the lens can be detected; and a movement unit that, when a focusing position of the lens is not detected in the area to be focused on in the plurality of first frames because a peak of the contrast evaluation values is not detected, is configured to determine a direction for moving the area to be focused on, based on a magnitude of a contrast evaluation value within the area to be focused on and a position of an area with the contrast evaluation value larger than or equal to a given threshold in each piece of image data of the plurality of first frames or a plurality of second frames newly acquired by the acquisition unit, and to move the area to be focused on in the determined direction; an outdoor determination unit that, when the peak of the contrast evaluation is not detected by the central processing unit and the direction for moving the area to be focused on is not determined by the movement unit, is configured to determine whether or not image data of the area to be focused on is outdoor image data; wherein, when the outdoor determination unit determines that the image data of the area to be focused on is outdoor image data, the movement unit is configured to move a position of the area to be focused on in a gravitational acceleration direction of a subject being imaged; and wherein, when the outdoor determination unit determines that the image data of the area to be focused on is not outdoor image data, the movement unit is configured to increase an area of the area to be focused on.