Patent ID: 7497079

Claim:
An exhaust manifold comprising: a plurality of branch pipe parts that are respectively connected to a plurality of exhaust ports of a multicylinder internal combustion engine, the plurality of branch pipe parts configured and arranged so as to provide at least one substantially centrally positioned branch pipe part; and a collecting pipe part that is formed by merging the plurality of branch pipe parts, wherein the plurality of branch pipe parts and the collecting pipe part are formed by an upper shell member and a lower shell member superposed on each other, wherein a partition plate is attached to at least one of the upper shell member and the lower shell member, and the partition plate separates between exhaust gases flowing into the collecting pipe part from two of the branch pipe parts respectively connected to adjacent two of the plurality of exhaust ports, and the partition plate is provided only to at least one substantially centrally positioned branch pipe part among the plurality of branch pipe parts.