1. An ocular funds portion analyzer, comprising: an image importing portion for importing an image of an ocular fundus portion taken by a visible radiation or a near-infrared radiation; a pixel data generation portion for generating pixel data including pixel positions and luminance of pixels constituting said image; a local plane gradient image generation portion for generating a three-dimensional image from pixel positions and luminance of said pixel data, obtaining a local approximation plane at any pixel and generating a local plane gradient image from a gradient angle with respect to a control plane of said three-dimensional image; and a display portion for displaying said local plane gradient image.