1. An image pickup apparatus, comprising: an image pickup lens; a lens array disposed on an image formation plane of said image pickup lens; an image pickup device adapted to receive a light ray passing through said image pickup lens and said lens array to acquire picked up image data; and an image processing section adapted to carry out an image process for the 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 viewpoint images.