1. A stereoscopic image generating apparatus, comprising: image obtaining unit, for obtaining a plurality of image groups, each image group constituted by a plurality of images for generating stereoscopic images and obtained by photography of subjects from different viewpoints; and image layout unit, for generating a stereoscopic layout image, in which a single image group selected from among the plurality of image groups as an image of interest is arranged at a predetermined position on a display screen in a stereoscopically viewable manner, and selected images from among the image groups other than the single image group are arranged such that they appear to be inclined and facing toward the predetermined position on the display screen at at least one of the right and left sides of the predetermined position; the image layout unit further comprising: first layout unit, for arranging a plurality of images of interest, which are included in the selected single image group, at the predetermined position corresponding to the plurality of viewpoints for generating the stereoscopic layout image within a plurality of layout images; second layout unit, for reducing the selected images in the width directions thereof at different reduction rates to generate a plurality of reduced selected images for each of the plurality of layout images in which the selected images are arranged, and arranging the plurality of reduced selected images, using a predetermined reference position at at least one of the right and left sides of the predetermined position at corresponding arrangement positions within the plurality of layout images as references; and stereoscopic converting unit, for generating the stereoscopic layout image from the plurality of layout images, in which the plurality of images of interest and the plurality of reduced selected images are arranged.