SOUND ABSORPTION STRUCTURE OF VEHICLE

To increase a sound absorption efficiency of a sound absorption member which absorbs noise outside a vehicle, invading from an extractor opening and transmitting in a cabin.SOLUTION: There are provided: a ventilation opening 88 for discharging air in cabins 2,3 to the outside of the cabins, in an interior wall 8 of the cabin 3; and an extractor opening 14 for discharging discharged air to the outside of the cabins 2,3 to the outside of a vehicle, in an exterior wall 6 of a vehicle body. A ventilation space 30 for communicating the ventilation opening 88 and the extractor opening 14 is provided between the cabin interior wall 8 and the vehicle body exterior wall 6, and a sound absorption member 20 extending between the ventilation opening 88 and the extractor opening 14 is arranged in the ventilation space 30. There are formed closed cross section ventilation passages 24A,25A whose cross sections in a direction orthogonal to a direction in which the sound absorption member 20 extends becomes closed cross sections surrounded by the sound absorption member 20 in the whole circumferences.SELECTED DRAWING: Figure 3 【課題】エキストラクタ開口から侵入し、車室内に伝播する車外の騒音を吸音する吸音部材の吸音効率を高めること。【解決手段】車室３の内壁８に、車室２，３の空気を車室外へ排出する通気用開口８８が設けられ、車体の外壁６に、車室２，３外へ排出した空気を車外へ排出するエキストラクタ開口１４が設けられ、車室内壁８と車体外壁６との間には、通気用開口８８とエキストラクタ開口１４とを連通する通気空間３０が設けられ、通気空間３０には、通気用開口８８とエキストラクタ開口１４との間に延びる吸音部材２０が配設され、該吸音部材２０が延びる方向に直交する方向の断面が該吸音部材２０によって全周が囲まれた閉断面となる閉断面通気経路２４Ａ，２５Ａを形成した。【選択図】図３