A refill case for a cosmetic compact, in which the refill case is detachably accommodated in a lower case of a cosmetic compact including an upper case and the lower case hinged to the upper case, the refill case comprising: a main body being configured such that an upper portion thereof is open, and including an inner wall providing an accommodation space in the main body, and an outer wall provided at an outer side of the main body with a predetermined gap between the inner wall and the outer wall; and a mesh fabric cover including a cylindrical vertical extension portion inserted in and brought into close contact with the gap between the inner wall and the outer wall, a rim portion extending from an upper end of the vertical extension portion by a predetermined width in an inward direction, and a mesh fabric interposed between an upper surface of the vertical extension portion and a lower surface of the rim portion such that upper and lower surfaces of the mesh fabric are integrally formed by being interposed between the upper end of the vertical extension portion and an outer edge of the rim portion along an edge of the mesh fabric, thereby covering an upper portion of the accommodation space; a sponge having a predetermined vertical thickness accommodated such that an outer side surface thereof is brought into contact with an inner side surface of the vertical extension portion along an edge thereof, so as to cover the accommodation space from under the mesh fabric; and the refill case being characterized in that it further comprises an auxiliary mesh fabric cover including an auxiliary rim portion accommodated such that an outer side surface thereof is brought into contact with the inner side surface of the vertical extension portion along an edge thereof, and an auxiliary mesh fabric integrally provided in the auxiliary rim portion along an edge thereof to cover the accommodation space from under the sponge, wherein both the sponge and the auxiliary mesh fabric cover are interposed between an upper end of the inner wall of the main body and a lower surface of the rim portion, such that the edge of the sponge and an outer edge of the auxiliary rim portion of the auxiliary mesh fabric cover are locked by being pressed by the upper end of the inner wall of the main body and the lower surface of the rim portion, by the cylindrical vertical extension portion inserted in and brought into close contact with the gap between the inner wall and the outer wall, and both the sponge and the auxiliary mesh fabric cover the accommodation space while being spaced apart from each other by a predetermined vertical gap due to the vertical thickness of the auxiliary rim portion. a main body being configured such that an upper portion thereof is open, and including an inner wall providing an accommodation space in the main body, and an outer wall provided at an outer side of the main body with a predetermined gap between the inner wall and the outer wall; and a mesh fabric cover including a cylindrical vertical extension portion inserted in and brought into close contact with the gap between the inner wall and the outer wall, a rim portion extending from an upper end of the vertical extension portion by a predetermined width in an inward direction, and a mesh fabric interposed between an upper surface of the vertical extension portion and a lower surface of the rim portion such that upper and lower surfaces of the mesh fabric are integrally formed by being interposed between the upper end of the vertical extension portion and an outer edge of the rim portion along an edge of the mesh fabric, thereby covering an upper portion of the accommodation space; a sponge having a predetermined vertical thickness accommodated such that an outer side surface thereof is brought into contact with an inner side surface of the vertical extension portion along an edge thereof, so as to cover the accommodation space from under the mesh fabric; and the refill case being characterized in that it further comprises an auxiliary mesh fabric cover including an auxiliary rim portion accommodated such that an outer side surface thereof is brought into contact with the inner side surface of the vertical extension portion along an edge thereof, and an auxiliary mesh fabric integrally provided in the auxiliary rim portion along an edge thereof to cover the accommodation space from under the sponge, wherein both the sponge and the auxiliary mesh fabric cover are interposed between an upper end of the inner wall of the main body and a lower surface of the rim portion, such that the edge of the sponge and an outer edge of the auxiliary rim portion of the auxiliary mesh fabric cover are locked by being pressed by the upper end of the inner wall of the main body and the lower surface of the rim portion, by the cylindrical vertical extension portion inserted in and brought into close contact with the gap between the inner wall and the outer wall, and both the sponge and the auxiliary mesh fabric cover the accommodation space while being spaced apart from each other by a predetermined vertical gap due to the vertical thickness of the auxiliary rim portion.