1. An image pickup apparatus, comprising: an image processing section adapted to carry out an image process for picked up image data, said image processing section including a viewpoint image production section adapted to produce a plurality of viewpoint images based on the picked up image data, and an image synthesis processing section adapted to synthesize two or more viewpoint images from among the plurality of viewpoint images, wherein said image synthesis processing section sets a synthesis rate higher for an image of an image pickup object at a position spaced by a greater distance from a focal plane.