Floor structure of building for insulation and noise interruption

A floor structure of a building for preventing noise between floors by reducing floor impact noise is provided to construct easily, to insulate sound and vibration, and to cut down construction cost and construction period by recycling industrial waste and making an insulation member and a damping member of industrial waste and by reducing impact noise. A damping layer is formed by spreading a damping sheet(21) on a steel concrete slab(11), and first and second EVA projection pads(31-1,31-2) with uneven projections are arranged thereon. An EVA chip pad(41) is mounted thereon, and a cement mortar layer(51) including a hot water pipe(52) is formed thereon. A surface finishing layer(53) is arranged on the cement mortar layer. The damping sheet is installed between the first EVA projection pad and the second EVA projection pad instead of mounting the damping sheet on the steel concrete slab.