A series of resonators are affixed to a vehicle engine air intake pipe path to provide muffling of air intake noises. An air intake port, facing toward the front of the vehicle, has a midsection bent back on itself. A connection opening is provided on the bent-back part. A pipe-form resonator, having a closed-off tip, is bent back on itself in roughly a U-shape at its midsection. A base end of the resonator is joined to the connection opening of the air intake port. This resonator makes it possible to muffle intake sound of frequencies that heretofore could not be absorbed by other affixed resonators.