To provide a cover preventing a flawing and a rusting by the contact or the like of a bicycle or the like of a pole such as an illuminating lamp and displaying a decorative effect.

The plastic cover fast stuck and covered on the outer circumference of the pole such as the illuminating lamp. Accordingly, the metallic pole such as the illuminating lamp is protected from a flaw and rust and the effect of a decoration is displayed. The deterioration of the strength and performance of the cover is inhibited even when the cover is exposed to rain and wind and the sun by manufacturing the cover having the above-mentioned structure of the quality of the material having the weather resistance and strength of acryl or being the same as or higher than acryl. A fine view is imparted to the surface by providing a pattern having a grade to the surface or the colored surface in the above-mentioned structure. Each structure is assembled by using the half parts of pipes and rings in which stepped sections are formed to the intermediate sections of the inside diameters, and constituted of members in which each mating surface and fitting sections are bonded with an adhesive.