In an image pickup apparatus, a parallax image acquisition unit acquires data of a plurality of viewpoint images having different viewpoints from an imaging unit. A detection unit detects the amount of change in a position or an attitude of the imaging unit which has generated the data of the plurality of viewpoint images. A calculation unit calculates a correction quantity of a shake correction unit and a mixture ratio of images when an image compositing unit generates a composite image from the plurality of viewpoint images on the basis of the amount of change in a position or an attitude of the image pickup apparatus. The image compositing unit generates a composite image from the plurality of viewpoint images using the calculated mixture ratio. The shake correction unit corrects image shake of the viewpoint images or the composite image according to the calculated correction quantity.