Patent ID: 8814172

Claim:
A cylinder head gasket sandwiched between a cylinder block and a cylinder head in which a combustion chamber, an oil passage, a water passage, and a bolt insertion passage are formed and provided with a combustion chamber hole drilled at a position of the combustion chamber, an oil hole drilled at a position of the oil passage, and a plurality of bolt holes drilled in conformity with a position of the bolt insertion passage, wherein the cylinder head gasket comprises a one piece gas seal plate in which the combustion chamber hole is drilled, an oil seal plate in which the oil hole is drilled, and a main plate provided between the gas seal plate and the oil seal plate and in which the plurality of bolt holes are drilled; the gas seal plate is provided with a bead surrounding the combustion chamber hole, the oil seal plate is provided with a bead surrounding the oil hole, and the main plate is provided with a bead surrounding each of the plurality of bolt holes; the plate thicknesses of the gas seal plate, the oil seal plate, and the main plate are different from each other, and the plate thickness of the gas seal plate is larger than the plate thicknesses of the oil seal plate and the main plate; and mutually adjacent end portions of the gas seal plate, the oil seal plate, and the main plate are connected to each other.