Patent ID: 7914008

Claim:
A metal gasket comprising: at least three metal plates including first, second and third metal plates laminated in this order from a top to form the metal gasket, identification marks provided at said second and third metal plates in a position not to overlap with one another in a lamination direction, and penetration windows, one penetration window being formed in each of the first and second metal plates, said penetration windows being arranged to see the identification mark therethrough located lower than the metal plate where the penetration window is formed, wherein the one penetration window formed in the second metal plate is arranged above the third metal plate such that the identification mark of the third metal plate is seen through the one penetration window of the second metal plate, and the one penetration window formed in the first metal plate is arranged above the second metal plate such that the identification mark and the penetration window of the second metal plate and the identification mark of the third metal plate are seen through the one penetration window of the first metal plate.