This building comprises a foundation, a main building part that is provided to the foundation and that has a framework structure, and a roof that is provided to the main building part and that has a truss structure. Moreover, a method for constructing the building includes: a first step for forming the foundation; a second step for creating the main building part having a framework structure on the foundation; and a third step for attaching, to the main building part, a roof frame having a pre-assembled truss structure.

Diagonal beam joining hardware according to one or more embodiments includes: a beam splicing part; an extending part protruding from an appropriate intermediate part of the beam splicing part; and a beam receiving hardware mounting part bending and extending from an end edge of the extending part to form a predetermined plane angle with respect to the beam splicing part. The beam splicing part is attached and fastened to a side face of a continued beam by through bolts and penetrating the beam in the beam width direction. Beam receiving hardware is fitted in a slit formed in an end part of the diagonal beam. A contacting part of the beam receiving hardware is superimposed on the beam receiving hardware mounting part of the diagonal beam joining hardware and fastened by bolt/nut fastening.

A concealed connector for connecting a first structural component to a second structural component includes a connection portion and a connection plate. The connection portion attaches to the second structural component. The connection plate attaches to the first structural component. The connection plate is coupled to the connection portion and extends into a slot in the first structural component. The connection plate has a perforated region that is penetrated by at least one fastener to attach the connection plate to the first structural component. The perforated region is deformed by the at least one fastener to permit the at least one fastener to penetrate the perforated region of the connection plate.