To provide a means for solving such a problem that a lid of a manhole is broken during construction.

A protection cover 20 for wrapping a support part 17 on a surface of a lid body 15 of the lid 10 attached to an opening and at its fringe 16 is provided, and the lid 10 is wrapped by the protection cover 20 during construction. Consequently, it is possible to prevent rubbing of the support part 17 and the adhesion of paint of the lid to concrete. Moreover, it is possible to prevent heavy equipment from riding on the lid 10 erroneously by forming the protection cover 20 by a conspicuous color. Furthermore, a part extending upward of the protection cover 20 can be used as a handle.