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A case comprising:

• a shaft disposed at either one of a cover or a case body;
• a shaft inserting portion disposed at the other of said cover or case body, said shaft being inserted into the shaft inserting portion such that the cover is turned with respect to the case body on the shaft to be thus opened;
• and
• urging means for urging the cover in an opening direction, a viscous material being charged between the shaft and the shaft inserting portion such that the cover is slowly opened with respect to the case body, wherein
• an engaging projection is disposed at either one of said shaft or the shaft inserting portion while an engaged recess engageable with said engaging projection is disposed at the other of said shaft or the shaft inserting portion so as to enlarge a contact area between said shaft and the shaft inserting portion via the viscous material.

A case comprising:

• a shaft disposed at either one of a cover or a case body;
• a shaft inserting portion disposed at the other of said cover or case body, said shaft being inserted into the shaft inserting portion such that the cover is turned with respect to the case body on the shaft to be thus opened;
• and
• urging means for urging the cover in an opening direction, a viscous material being charged between the shaft and the shaft inserting portion such that the cover is slowly opened with respect to the case body, wherein
• said shaft includes a joint detachable along an axial direction thereof, and a shaft length in the shaft inserting portion can be variably adjusted, thus adjusting a contact area between said shaft and the shaft inserting portion via the viscous material.