| 摘要 |
A collecting part structure of an exhaust manifold, in which connecting portions of branch pipes 2 to 5 to a head flange 1 are arranged on a straight line, has a reinforcement member that includes two flat plates 10 and 11 to collect and fix downstream side portions f the branch pipes 2 to 5. The flat plates have the same length as an inner diameter of a collecting part 6, and are formed at central positions thereof with slits S1 and S2 facing each other to be joined with each other like a cross shape. The flat plate 11 with the slit S2 at an exhaust-gas upstream side, of the two flat plates 10 and 11, is arranged on a line A2 parallel to a line on which the connecting portions of the branch pipes 2 to 5 to the head flange 1 are arranged.
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