Patent ID: 8248516

Claim:
A focus adjustment apparatus comprising: a detection unit configured to detect an object image to be focused from a captured image; a setting unit configured to set a focus detection region in the captured image; and a focus adjustment unit configured to adjust an in-focus state of an imaging optical system depending on AF evaluation values based on output signals from the focus detection region, wherein the setting unit sets a first focus detection region which has followed the object image detected by the detection unit, and a second focus detection region which does not follow the object image detected by the detection unit, and the focus adjustment unit performs a weighted addition of the AF evaluation values based on the output signals in the first focus detection region and the second focus detection region at ratios depending on at least one of a size of an object image within a screen, a position of the object image within the screen, and a shooting mode, and adjusts the in-focus state of the imaging optical system based on a result of the weighted addition, when the detection unit detects the object image, and the setting unit sets the second focus detection region, and the focus adjustment unit adjusts the in-focus state of the imaging optical system based on the AF evaluation values based on the output signals in the second focus detection region, when the detection unit does not detect the object image.