A curve rendering device is provided which is capable of judging whether a further approximation process is necessary for an approximation curve obtained by an immediately previous approximation process, and includes: a path dividing unit for calculating segmentation points on a center line; an outline point calculating unit for calculating, for each of the segmentation points, two offset points; a judging unit for calculating a distance between offset points, and judging a ratio of the longer distance to the shorter distance is greater than a predetermined value; and a curve forming unit for approximating, between two partial outlines, the longer one of the two partial outlines by using a greater number of line segments than line segments used to approximate the shorter one of the two partial outlines when the ratio is judged to be greater than the predetermined value.
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