PROBLEM TO BE SOLVED: To provide an aluminium building material excellent in performance against heat applied from the outside.SOLUTION: An aluminium building material includes a body (21) having a hollow part (21a), a water-retentive material (22) that is arranged within the hollow part, and a solvent that is included within the hollow part. A circulation passage, through which the solvent evaporated by heating can be moved, is formed from the water-retentive material.