US Patent 9683366 Soundproof room

The soundproof room (41a) has an interior space (43a) defined by soundproof walls (44a, 45a, 46a, 47a). The soundproof room (41a) includes a sound absorber (11a) whose sound absorbing face absorbs sound in the room and is exposed in the room. The sound absorber (11a) has a varying depth dimension from a front face (19a), serving as the sound absorbing face, toward the depth direction. The sound absorber (11a) is formed by stacking a plurality of layer members from the front face (19a), serving as the sound absorbing face, in the depth direction.