IMAGE STABILIZATION APPARATUS, METHOD OF CONTROLLING THE SAME, AND STORAGE MEDIUM

An image stabilization apparatus includes a subject detection unit, a motion vector detection unit, a separation unit for separating a motion vector of a main subject and that of a background, a calculation unit for calculating a correction amount for correcting image blur, and a control unit for controlling, in a case where a second main subject is detected, so as to transition from a state in which the calculation unit calculates the correction amount based on a first motion vector of the first main subject, via a state in which the correction amount is calculated based on the third motion vector of the background, to a state in which the correction amount is calculated based on a second motion vector of the second main subject.