To provide a sunshade tool attached to a helmet, corresponding to both the sunshine and the sunshade and easily performing turning over thereof in the sunshade tool.

The sunshade tool is used as a sunshade by hanging thereof into the form of an arch in the occipital region and both sides of the helmet. As constitution thereof, an arch material 3 for providing the form of the arch is attached to the upper part of the sunshade hanging material 2 and both ends of the arch material are supported on both the sides of the helmet with fixing tools 4. The occipital region and both sides are covered with the sunshade tool during exposure to the sunshine. The arch part is rotated and moved to the top of the helmet by a hand during the sunshade. Thereby, the sunshade tool easily turned over and attached to the helmet is provided.