Patent ID: 6953357

Claim:
A packing arranged between a first article and a second article for keeping watertight the boundary therebetween, comprising: a solid-core ring-shaped packing body having a thickness in a first direction in which the first article and the second article face each other larger than a width in a second direction orthogonal to the first direction; a first protruding piece which protrudes outwardly from an outer edge of said solid-core ring-shaped packing body at a midpoint along the thickness of the packing body a securing portion attached to said first protruding piece and secured to said first article, a second protruding piece which protrudes inwardly from an inner edge of said solid-core ring-shaped packing body; wherein the securing portion extends from the first protruding piece so that the first portruding piece provides a restoring force preventing said packing body from falling or rolling to one side when the first and second articles are mated.