1. A compound-eye imaging device comprising: multiple imaging units having optical lenses and a solid-state imaging element with a major surface for allowing the solid-state imaging element to image multiple unit images of a target object that are formed through the optical lenses; and reconstructed image forming means for forming a reconstructed image from the multiple unit images respectively imaged by the multiple imaging units, wherein the multiple imaging units are integrally arranged, and wherein the multiple imaging units have randomly different optical imaging conditions from each other to allow the multiple unit images imaged by the multiple imaging units to be different from each other when the target object is indefinitely far.