METHOD OF CONSTRUCTING BUILDING, AND ROOM MODULE

PROBLEM TO BE SOLVED: To provide a method of constructing a building capable of reducing work amount on site, and shortening a construction period, by further expanding a room modularization range.SOLUTION: When a plurality of room modules 10, 10... is installed on a floor surface 28 of a building in a lattice pattern, four column materials 14, 14... raised at inside corners of four adjacent room modules 10, 10... are used as framework columns 12 of the building. Namely, the column materials 14 of square-shaped steel pipes included in the room module 10 are used as the framework column 12. Therefore, on a site, it is not necessary to construct the framework column 12, and while installing the room module 10 on the site, the framework column 12 can be constructed by using the column materials 14, 14... of the room module 10.