To provide a base for concrete slab and a structure having the base for concrete slab securing higher soundproofing performance and sound insulating performance without causing any cost increase in comparison with a conventional concrete slab using an embedded material with the flat surface.

The embedded material 10 anchored onto a precast concrete plate 3 is composed of a plurality of unit embedded material 11 connected to one another in the state of forming vertically communicating spaces 12 in all or part among them. The base A for the concrete slab is manufacture using the embedded material 10 in which each unit embedded material 11 is provided with at least a first region 13 with external shape of having a minimum area at the uppermost end and gradually expanding downward in the horizontal cross-sectional area, and the concrete slab is constructed using the base A. Vibration caused by floor impact applied to an upper concrete shell part of a concrete slab hollow parties dispersed and damped along the curved surface of the upper concrete shell part positioned on the semispherical upper surface of the unit embedded material 11 to relieve the occurrence of a resonance phenomenon.