PROBLEM TO BE SOLVED: To provide a gasket having excellent performance such as slidability and resistance to liquid leakage.SOLUTION: A gasket 1 includes two or more annular projection parts 14a-14c and one or more annular troughs 15a, 15b on a sliding surface, and a polymer chain is immobilized on at least a part of the sliding surface. The annular projection parts include a first projection part 14a on a topmost surface side and the other projection parts. With respect to an outer diameter 100% of the first projection part, the outer diameter of each of the other projection parts is 94-98%, and the outer diameter of each of the annular troughs is 85-92%.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2018,JPO&INPIT【課題】摺動性、耐液漏れ性等の性能に優れたガスケットを提供する。【解決手段】摺動面に2個以上の環状突出部14a~14c及び1個以上の環状谷部15a、15bを備え、かつ摺動面の少なくとも一部にポリマー鎖が固定化されたガスケット1であって、環状突出部は、最も天面側の第1突出部14a及び他の突出部を有し、第1突出部の外径100%に対して、他の突出部の外径が94~98%、環状谷部の外径が85~92%であるガスケット。【選択図】図1
