<p>A 3-dimensional image data generating method generates a natural 3-dimensional image having a stereoscopic effect and providing an observer with little fatigue in a technique of acquiring a stereoscopic view of images for left and right eyes as 2-dimensional images having parallax to each other. The 3-dimensional image data generating method generates 3-dimensional image data for a stereoscopic view including an image for a left eye and an image for a right eye as 2-dimensional images having parallax to each other, and performs: a left eye image data acquiring process of acquiring image data for a left eye obtained by an observation in a first direction from a predetermined position; and a right eye image data acquiring process of acquiring image data for a right eye obtained by an observation in a second direction leftward from the first direction from the same predetermined position.</p>
