PURPOSE: To effectively improve intake charging efficiency for a cylinder and improve supporting rigidity of a resonance means by setting the state of connection of a resonance means to an intake manifold formed by provision of a plurality of individual intake passage part and a collection part so that the pressure wave of intake air may be propagated efficiently to each cylinder.

CONSTITUTION: An intake manifold 5 equipped with a collection part 8 for which plural individual intake passage parts 7 and upstream side opening end parts thereof respectively, are collected and connected thereto and a resonance space forming part 20 which has a resonance passage part 21 and a resonance chamber part 28 communicated with the collection part 8. One of the opening end parts at the resonance passage part 21 of the resonance space forming part 20 is connected to the collection part 8 in a position facing to the upstream side opening end part of the plural individual intake passage parts 7 opened thereto. Most parts of the resonance passage 21 and resonance chamber part 28 are integrally formed with the collection part 8.