Abstract: An architecture unit of a concrete structure is formed by providing a pair of wall bodies facing each other substantially in parallel with each other on a foundation. The wall bodies are each composed of a porous steel-made formwork panel having large and small ribs formed on a surface thereof, a runner provided with a fitting groove fitted with lower ends of a plurality of formwork panels arranged side by side, and a cap fitted with upper ends thereof. A long-plate-like lower fixing member provided with ribs at both ends thereof is spanned and fixed on a lower face of the runner so as to be substantially perpendicular to the runner, and a long-plate-like upper fixing member provided with ribs at both ends thereof is spanned and fixed on a top face of the cap so as to be substantially perpendicular to the cap.