To prevent the contact part with a connecting member from injuring due to the displacement of partition plates by providing a movable connecting member connecting the partition plates to each other while closely contacting with both partition plates, when a pair of exhaust pipes respectively having a plurality of exhaust passages divided with partition plates are connected together while confronting the partition plates with each other.

When respective dual pipes 10, 12 on the upper and downstreams are vibrated during operation of an engine, a gasket 62 and the connecting part 50 of a downstream side flange 44 are displaced against each other. At this time, a connecting member 28 is also vibrated and displaced against downstream side partition plate 56. Further the connecting member 28 is displaced according to the displacement of the spherical surface 64 of the gasket 62 against the inner face 52 of a connecting part 50. Consequently, because the connecting member 28 is pressed against the downstream side partition plate 56, an exhaust passage 22, 58 and an exhaust passage 24, 60 are closed up tightly from each other. Further, a lubricating body 34 is fitted to the extreme end of the connecting member 28, and the extreme end face is formed into a spherical surface, and hence the extreme end face 61 of the lower stream side partition plate 56 is prevented from injuring accompanying the displacement of the connecting member 28.