SOUND ABSORPTION MATERIAL

To provide a sound absorption material which is thin and lightweight and exerts more excellent sound absorbing effect particularly in the range of living noise (600 to 2000 Hz).SOLUTION: A sound absorbing material 10 is used by being placed on a plate material 90. This sound absorbing material 10 comprises a first three-dimensional knitted fabric 20 having a first air permeability and disposed so as to face the plate material 90, and a second three-dimensional knitted fabric 30 laminated on the first three-dimensional knitted fabric 20 and having a second air permeability different from the first air permeability, and the sum of the thickness of the first three-dimensional knitted fabric 20 and the thickness of the second three-dimensional knitted fabric 30 is 10 to 30 mm.SELECTED DRAWING: Figure 1 【課題】厚さが薄く、軽量であり、特に生活騒音の音域（６００〜２０００Ｈｚ）において、より優れた吸音効果を発揮する吸音材を提供すること。【解決手段】吸音材１０は、板材９０上に載置されて用いられるものである。この吸音材１０は、第１の通気度を有し、板材９０と対向するように配置される第１の立体編物２０と、第１の通気度と異なる第２の通気度を有し、第１の立体編物２０に積層される第２の立体編物３０とからなり、第１の立体編物２０の厚さと第２の立体編物３０の厚さの合計が１０〜３０ｍｍである。【選択図】図１