SOUND ABSORPTION DEVICE

To provide a sound absorption device capable of improving reduction effect of sounds propagating in the air.SOLUTION: A passage member 10 has a passage through which air flows. A fine perforation board 20 is a tabular member where a plurality of fine through holes 21 are bored, and is provided so as to have: one surface which is engaged in an air-flowing field 11 of the passage; and the other surface which faces an inner wall surface 13 of the passage member through an air layer 12. The air flowing through the through holes 21 generates viscous attenuation effect. The plurality of through holes 21 are arranged in positions deviating from a direction orthogonal to a center line CL of the passage, without being arranged linearly in the direction, in the through holes 21 which are at least adjacent to each other.SELECTED DRAWING: Figure 3 【課題】空気中を伝播する音の低減効果を高めることの可能な吸音装置を提供する。【解決手段】通路部材１０は、空気の流れる通路を有する。微細穿孔板２０は、複数の微細な貫通孔２１が穿たれた板状の部材であって、一方の面が通路のうち空気の流れ場１１に臨み、他方の面が空気層１２を介して通路部材の内壁面１３と対向するように設けられ、貫通孔２１を通過する空気により粘性減衰作用を発生させる。そして、複数の貫通孔２１は、少なくとも隣り合う貫通孔２１において、通路の中心線ＣＬに対し直交する方向に直線状に配置されることなく、その方向に対してずれた位置に配置されている。【選択図】図３