To obtain an inexpensive ring ornament having a continuous twist.

A shade body 1 is provided. A synthetic resin ring ornament 2 almost arranged horizontally along the shade body 1 is provided. An outline of a cross section of the ring ornament 2 is presented by a polygon involved in not less than three vertexes P1, P2, P3, and P4. The ring ornament 2 is presented by a doughnut around a vertical axis Y. Its outline of the cross section is presented by a twist (Q) smoothly rotating while moving around. The ring ornamanet 2 is formed by combining a synthetic resin ring upper half body 22 over a virtual middle horizontal plane X with a synthetic resin ring lower half body 24 thereunder. All outlines of the cross section of the ring ornament 2 around the vertical axis Y are corrected to acid and form a new vertex PO, which exists on the virtual horizontal plane X and is visible from both a plane and a base.