Patent ID: 7451877

Claim:
A refill case comprising: a middle plate having a shape of a bottomed short cylinder containing a cosmetic item, the middle plate having an outward brim along an upper periphery of the plate; a case body, which accepts and keeps the middle plate in a storage cylinder under the condition that the brim sits on a top flat rim of the storage cylinder; and a cap, which is fitted around said the case body detachably in screw engagement, and which is used to seal the middle plate through tight contact of the brim with a ring-shaped gasket made of a soft, elastic material, the gasket being embraced by an underside of a roof and fitted thereto in an undetachable manner but in a state having play relative to the roof, wherein the gasket includes a ring-shaped main gasket portion, which elastically comes in tight contact with the brim and a ring-shaped fitting portion, the ring-shaped fitting portion being disposed on an inward side of the main gasket portion and used for fitting to the cap, wherein the gasket is fitted to the cap in an undetachable manner but in a state having play relative to the roof, while the fitting portion is disposed between the roof and a gland, the gland being fixed to the roof, and wherein a butting wall is disposed on either one of the case body or the cap so as to butt against the other one at a position in which screw engagement of the cap with the case body is complete and in which soft contact deformation of the gasket is controlled within a range of elastic deformation.