Patent ID: 8857164

Claim:
An exhaust manifold to be connected to an internal combustion engine with a plurality of exhaust ports, the exhaust manifold comprising: a first upper shell member; a second upper shell member, the first and the second upper shell members comprising a plurality of upper branch pipe parts; and a lower shell member comprising a plurality of lower branch pipe parts, each one configured to be coupled to a corresponding one of the plurality of upper branch pipe parts such that each of the plurality of lower branch pipe parts and upper branch pipe parts together form one of a plurality of flow passages; each of the first upper shell member, the second upper shell member, and the lower shell member being formed by press molding a plate material, wherein the first upper shell member and the lower shell member are superposed on each other, to thereby form a first flow passage to be connected to at least one exhaust port out of the plurality of exhaust ports, and wherein the second upper shell member is superposed on the lower shell member with the first upper shell member sandwiched therebetween such that at least a part of the first upper shell member that forms the first flow passage is exposed, to thereby form a second flow passage to be connected to another at least one exhaust port out of the plurality of exhaust ports.