PURPOSE: To obtain a clock sheath structure having small number of parts by constituting a clock sheath of a case band formed in one body with a back cover, a bezel and glass, to be attachable and detachable to and from other member.

CONSTITUTION: Glass 1 is fixed to a bezel 3 through packing 2. The bezel 3 has an inside part 31 and a fitting part 32 to the case band. The case band made of plastic consists of a back cover part 41 and a wall part 42, and has a holding part 43 of a movement inside, and a fitting part 43 fitted into the fitting part 32 of the bezel 3, above the wall part. On the outside of the wall part 42, an outside wall part 44 is provided as one body, and its outside circumferential part is provided with a fitting part 45 to be fitted into other member 5.