PURPOSE: To provide the titled alloy consisting of a prescribed percentage each of Zr and Si and the balance Al with inevitable impurities, showing superior dropping resistance during heating in a brazing stage, and preventing the corrosion of a tube material as the opposite member by the superior sacrificial anode effect.

CONSTITUTION: This Al alloy for the fin material of a heat exchanger consists of, by weight 0.02W0.2% Zr, 0.2W1.0% Si and the balance Al with inevitable impurities or contains further 0.1W0.7% Mg. Since the Al alloy has superior dropping resistance and sacrificial anode effect, when it is used as the fin material of a heat exchanger made of Al alloy, the occurrence of fatigue and deformation during brazing is prevented. Accordingly, the heat exchanger can be manufactured in a high yield, and it shows superior corrosion resistance and can be used for over a long term.