Siding boards attachment structure

A siding boards attachment structure in which a plurality of external wall members are secured to a structural body of a building with securing members in a rabbet joint manner, comprising:

• the securing member being secured to the structural body in a state in which an upper side lower-ledge formed at an upper edge of the external wall member to be disposed at an internal side is engaged with a lower side upper-ledge formed at a lower edge of the external wall member to be disposed at an external side,
• a size adjusting external wall member having a cut end portion for adjusting its width among the plurality of external wall members with the cut end portion being secured to the structural body with an end portion securing member,
• the end portion securing member being provided with a backboard portion to be secured to the structural body and a forwardly bent portion forwardly bent from one edge of the backboard portion, and
• the backboard portion of the end portion securing member being in contact with a rear side surface of the size adjusting external wall member and the forwardly bent portion of the end portion securing member is in contact with the cut end face of the size adjusting external wall member,
• wherein the backboard portion and the rear side surface of the size adjusting external wall member are bonded to each other with an adhesive agent.