To provide a building capable of being simply constructed and obtaining the excellent heat-insulation effect even if it is a house with a small space like a bungalow.

Roof section 1, side wall section 2 and floor section 3 forming a house are respectively formed of inside and outside membrane layers 4 and 5 of sheet cloth, and the roof section 1 and side wall section 2 are formed of a series of exterior finishes 8. An interval is made between both inside and outside membrane layers 4 and 5 through a spacer 6 of net both, a plurality of through-holes 7 are provided to at least one membrane layer of both inside and outside membrane layers 4 and 5, and an interval between both inside and outside membrane layers 4 and 5 is filled with foam resin layer 22 through the through-holes 7.