| abstract |
[Problem] To provide a means that can suppress decreases in the soundproofing performance of a soundproofing material that exhibits high soundproofing performance across a broad range of frequency bands of 2000Hz and below. [Solution] A soundproofing material comprising an elastic sheet and a support part that holds the sheet and divides the sheet into compartments, wherein the sheet rigidity (k) and the sheet surface density (m) of the compartments satisfies the relationship in formula 1. A soundproofing structure is formed by arranging said soundproofing material on a substrate, and, when doing so, further arranging a vibration isolation layer between the soundproofing material and the substrate. [formula 1] |