SOUNDPROOF STRUCTURAL BODY

WIPO Patent Application WO/2020/080151

A1

This soundproof structural body is provided with: a film-like member having a plurality of through holes penetrating in the thickness direction; and a back surface air layer that is fully closed on the back surface of the film-like member. There are at least two local maximum values in a hole radius distribution histogram function σ(r) that indicates an opening rate σ with respect to the hole radius r of the plurality of through holes of the film-like member. When σ(r1) and σ(r2) are two of the local maximum values, at least a combination of the local maximum values satisfying inequality expression (1): σ(r1)>σ(r2) r1