SOUND-INSULATING WALL AND SOUND-INSULATING ROOM

PROBLEM TO BE SOLVED: To form sound-insulating walls as separation walls of acoustical various rooms in structure, in which the sound-insulating walls can correspond to the time of the generation of the change of a site planning, and to ensure a sound field clearer than that in the case where plasterboards are used on surfaces on the insides of the rooms. SOLUTION: The sound-insulating wall is composed of a fixed sound- insulating wall 2 consisting of a precast concrete board arranged between an upper-layer side slab 4 and a lower-layer side slab 5 and a floating sound- insulating wall 3 made up of the precast concrete board forming a space between the floating sound-insulating wall 3 and the fixed sound-insulating wall 2 and being disposed onto the lower-layer side slab 4. A floor board 6 consisting of concrete is laid on the lower-layer side slab 5 under the state, in which the floor board 6 is not brought into contact directly with the lower-layer side slab 5, and the floating sound-insulating wall 3 is arranged onto the floor board 6.