Patent ID: 7441309

Claim:
A hinge structure of a case, intended to join a synthetic resin case body and a synthetic resin lid together in a manner capable of opening, turning, and closing said lid, said hinge comprising: first hinge connectors, including first shaft holes, disposed at a rear of said synthetic resin case body in which to contain a cosmetic material; a second hinge connector, including a second shaft hole, disposed at a rear of said synthetic resin lid that opens or closes said case body; two hinge shafts made of a synthetic resin, with each shaft being inserted through said first shaft holes and said second shaft hole; two cylindrical, protruded fitting parts, with the center of said first shaft holes serving as a central axis, disposed so as to protrude from end faces of said first hinge connectors that come in end-to-end abutment with the second hinge connector; and two substantially U-shaped, recessed fitting parts correspondingly disposed on end faces of said second hinge connector that come in end-to-end abutment with the first hinge connectors, said recessed fitting parts having an opening towards a front side of said lid the opening extending between the front side of the lid and the second shaft hole, the entire opening having a width at least one of greater than and substantially equal to a diameter of the protruded fitting parts, and the recessed fitting parts having a center of curvature that corresponds to a center of the second shaft hole and a radius of curvature substantially the same as a radius of curvature of said protruded fitting parts.