that is formed in the coolant inlet hole h of the cylinder head 101 according to various aspects of the present invention the valve boss portion wb is strengthened by the reinforcing boss rb in the cylinder head 10 1 the cylinder head gasket 103 that have the above structures may have the lift amount minimized when the coolant flows through the coolant inlet hole h from the coolant pump in addition the bridge 100 and the bridge sealing portion bs that are respectively formed corresponding to the coolant inlet hole h of the cylinder head 101 and the coolant penetration hole 1 h of the cylinder head gasket 103 have engagement force of the head bolt that is uniformly transferred such that the lift amount of the cylinder head gasket 103 is minimized accordingly the leaks of the combustion gas the coolant the oil and so on are prevented at the edge thereof also the cylinder head gasket 103 has the structure of the dual beading b 1 and b 2 corresponding to the gasket attachment surface of the cylinder head 101 such that the air tightness is increased compared to a single beading structure accordingly the attachment force of the cylinder head gasket is increased and the up and down movement of the gasket corresponding to the coolant inlet portion is minimized such that the leaks of the combustion gas coolant oil and so on can be prevented for convenience in explanation and accurate definition in the appended claims the term.