To provide a covering body for a helmet, which is especially designed so that a wearer of a helmet or a protective hat safely can carry out operation and especially, the wearer completely can avoid risk in operation at night, and to provide a helmet to which the covering body is attached.

The covering body for a helmet is freely detachable from helmet and covers at least a part of the outside of the helmet when attached to the helmet, and the covering body has a plurality of light-generating parts and a plurality of reflecting parts reflecting light generated from the light-generating parts to the circumference. The helmet is obtained by attaching the covering body to the helmet.