PURPOSE:To make a manifold small and light by providing a noise eliminating means on the exhaust side of a fluid passage of the manifold. CONSTITUTION:First to fourth hole parts 18, 20, 22, 24, and communication holes 26-31 are formed from the side faces of a manifold base 14, and noise absorption member 36 or a sound insulation member 38 is fixed along the face on the inner face of the fourth hole part 24 which serves as exhaust side of the fluid passage. Porous material such as felt, unwoven cloth, urethane foam and the like is used for the noise absorption member 36, and metal plate like lead, plaster plate and the like are used for the sound insulation member 38. The manifold is made small and light without mounting any silencer outside the manifold 10.
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