The present invention provides a building to be constructed without any troublesome work.The building is a building comprising a construction material 12, which has a plane heat insulation material 14 in which a madreporic core material is enclosed in a vacuum and a plate structural face material 12a, and whose heat insulation material 14 and structural face material 12a are combined in a way that a plane surface of the heat insulation material 14 faces to one side of a plane surface of the structural face material 12a, and further comprising a wooden base 9b assembled on the construction material 12 and an external wall finishing material 3 fixed on the wooden base 9b.