An image pickup apparatus includes a focus adjustment unit, an image sensor, a focus evaluation value calculation unit, and a control unit configured to drive the focus adjustment unit based on a focus evaluation value to perform an in-focus operation. A change curve representing a change amount of a focus evaluation value indicating a focusing state of an object image includes a first slope before inversion of a sign of an inclination of the change curve at a peak value on the change curve and a second slope after inversion of a sign of an inclination of the change curve at a peak value on the change curve. The control unit determines whether the focus evaluation value corresponding to the peak value on the change curve is used for the in-focus operation based on an inclination of the first slope and an inclination of the second slope.