Abstract: A refill case that includes a middle plate, the middle plate has a bottomed short cylinder shape that contains a cosmetic item and an outward brim along the periphery, a case body that accepts and keeps the middle plate, and a cap that is fitted around the case body detachably in screw engagement. The refill case also includes a ring-shaped gasket made of a soft, elastic material used to seal the middle plate through tight contact of the brim, and a butting wall disposed on either one of the case body or the cap to butt against the other one at a position in which screw engagement of the cap is complete and in which soft contact deformation of the gasket is controlled within a range of elastic deformation. The gasket is fitted to the cap in an undetachable manner but having play relative to the roof.

Abstract: It is the objects of this invention to keep the middle plate sealed stably and securely in the refill case and thereby to maintain safely the quality of the cosmetic item inside the middle plate with no regard to the sealing of the middle plate and to make the middle plate replaceable at the user's own discretion.