Abstract: An object is to provide a muffling apparatus that can sufficiently reduce noise including a plurality of frequencies, can save space, can easily adjust a frequency to be muffled, and can suppress an increase in the air-flow resistance in a suction passage. A muffling apparatus includes a resonator main body having a predetermined volume, and a communication tube that allows the resonator main body to communicate with a suction passage of an internal combustion engine, wherein the resonator main body includes two or more branch resonant chambers that are branched from the communication tube, and the communication tube includes a connection port connected to the suction passage, and a branch pipe branched to each of the two or more branch resonant chambers.

Abstract: There is provided a muffling apparatus capable of sufficiently reducing noise, achieving space saving, and suppressing an increase in air-flow resistance in a suction passage. In a muffling apparatus including a resonator main body having a predetermined volume and a communication tube that allows the resonator main body to communicate with a suction passage of an internal combustion engine, the communication tube includes a first communication tube having one end that communicates with the suction passage, a second communication tube having one end that communicates with the resonator main body, and a continuous section that communicates with other ends of the first and second communication tubes, and a third communication tube is formed at the continuous section.