To make it possible to provide a caulking compound to a joint without a hitch between a plurality of exterior wall panels forming exterior wall surfaces opposed to unit buildings opposed and adjacent to each other.

Continuous ridge unit buildings are so constituted that a plurality of one ridge unit buildings formed by combining a plurality of building units 11A are connected through expansion joints. Then, a buck-up material 22 and a caulking compound 23 are provided to a joint 21 between a plurality of exterior wall panels 15 forming exterior wall surfaces 19 opposed to the joint buildings opposed and adjacent to each other, and the caulking compound 23 is provided backward of an indoor side from the back-up material 22.