A final disposal site comprising: a landfill area in which a plurality of landfill regions are set so that a banking material including wastes is input and a compressed solidification of the banking material is sequentially formed, and a periphery thereof is defined by a side wall portion; and a building which accommodates the landfill area and a bottom portion thereof being configured by a bottom plate structure, wherein the bottom plate structure includes a first waterproof structure which is provided on a ground and an RC layer which is provided on the first waterproof structure so as to define a bottom of the landfill area, wherein the first waterproof structure includes concrete (32, 34) and a waterproof unit, wherein the side wall portion is formed as a part integrated with the RC layer by reinforcement concrete using a reinforcement uprightly formed from the RC layer as a main reinforcement, wherein a surface of the integrated part is covered by a second waterproof structure, wherein a peripheral edge of the RC layer is provided with a vertical wall which is uprightly formed from the RC layer so as to be integrated with the RC layer, wherein a lower end surface of a side wall of the building is connected to an upper end surface of the vertical wall, wherein the second waterproof structure extends to an inner surface of the vertical wall, wherein the vertical wall, the side wall portion, and the RC layer form a concave area of which an upside is opened and an inside is covered by the second waterproof structure, and wherein a traveling path along which a ceiling hoist transporting the banking material forming the compressed solidification to the landfill region travels is provided on the second waterproof structure of a bottom portion of the concave area. a landfill area in which a plurality of landfill regions are set so that a banking material including wastes is input and a compressed solidification of the banking material is sequentially formed, and a periphery thereof is defined by a side wall portion; and a building which accommodates the landfill area and a bottom portion thereof being configured by a bottom plate structure, wherein the bottom plate structure includes a first waterproof structure which is provided on a ground and an RC layer which is provided on the first waterproof structure so as to define a bottom of the landfill area, wherein the first waterproof structure includes concrete (32, 34) and a waterproof unit, wherein the side wall portion is formed as a part integrated with the RC layer by reinforcement concrete using a reinforcement uprightly formed from the RC layer as a main reinforcement, wherein a surface of the integrated part is covered by a second waterproof structure, wherein a peripheral edge of the RC layer is provided with a vertical wall which is uprightly formed from the RC layer so as to be integrated with the RC layer, wherein a lower end surface of a side wall of the building is connected to an upper end surface of the vertical wall, wherein the second waterproof structure extends to an inner surface of the vertical wall, wherein the vertical wall, the side wall portion, and the RC layer form a concave area of which an upside is opened and an inside is covered by the second waterproof structure, and wherein a traveling path along which a ceiling hoist transporting the banking material forming the compressed solidification to the landfill region travels is provided on the second waterproof structure of a bottom portion of the concave area.