Sound absorbing device

The passage member (10) has a passage through which air flows. The fine perforated plate (20) is a plate-shaped member having a plurality of fine through-holes (21) penetrating therethrough, is provided such that one surface faces the flow field (11) of the air in the passage and the other surface faces the inner wall surface (13) of the passage member with an air layer (12) therebetween, and generates a viscous damping effect by means of the air passing through the through-holes (21). Furthermore, among the plurality of through-holes (21), at least adjacent through-holes (21) are not disposed in a straight line in a direction orthogonal to the center line (CL) of the passage, but are disposed at positions shifted from the direction orthogonal to the center line (CL) of the passage. 通路部件(10)具有供空气流动的通路。微细穿孔板(20)是穿透有多个微细的贯通孔(21)的板状的部件，被设置为一个面面对通路中的空气的流场(11)，另一个面隔着空气层(12)与通路部件的内壁面(13)相对，该微细穿孔板(20)利用通过贯通孔(21)的空气而产生粘性衰减作用。而且，在多个贯通孔(21)中，至少相邻的贯通孔(21)不沿与通路的中心线(CL)正交的方向配置为直线状，而被配置在相对于与通路的中心线正交的方向错开的位置。