PURPOSE:To reduce the parts to be constructed in a field, to facilitate fitting of a siding material, and to prevent dew condensation in the interior of a wall panel. CONSTITUTION:In a siding external wall structure 10 having a wall panel 11 and an inorganic siding material 14 fitted to the outer surface of the panel, the surface of the wall panel 1 is provided with plural first locking members 12, and the back of the siding material 14 is provided with plural second locking members 13. The first locking member 12 is formed in such a manner as to be U-shaped in a side view, and the recessed part is opened to the upper side and the side to be taken as a first engaging recessed part 15. The second locking member 13 is formed in such a manner as to be U-shaped in a side view, and the recessed part is opened to the lower side and the side to be taken as a second engaging recessed part 17. The siding material 14 is removably installed on the surface of the wall panel 11 by engaging the second engaging recessed part 17 of the second locking member 13 and the first engaging recessed part 15 of the first locking member 12 with each other.
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