An external wall constructing structure excellent in ornamental appearance,
weather resistance, contractibility, and safety is provided. An external wall constructing structure 1 comprising external wall panels that are joined to each other by vertical and horizontal
shiplap joints and secured to a skeleton of a building by securing a
metal fitting 5. A
cut-off end portion 23 of a dimension-adjusted external wall panel 20 among the plurality of external wall panels is fixed to a skeleton 10 of the building via end constructing bracket 3. Left and right joint end portions of the dimension-adjusted external wall panel 20 are fixed to the skeleton 10 via lateral end securing
metal fittings 6. In the end constructing bracket 3, a rear plate portion 31 is abutted on rear surface 26 of the dimension-adjusted external wall panel 20 and forward-bending portion 32 is abutted on
cut-off end surface 231 of the dimension-adjusted external wall panel 20. The rear plate portion 31 and the rear surface 26 of the dimension-adjusted external wall panel 20 are adhered by
adhesive agent 11. The forward-bending portion 32 of the end constructing bracket 3 has horizontal section 320, front section 321 and third abutting section 322 and sealing material 163 is placed in front of the front section 321.