PURPOSE: To improve the brazability, high temp. buckling resistance and heat conductivity of a fin material for a heat exchanger.

CONSTITUTION: As an aluminum alloy for a fin material, the one constituted of, by weight, 0.03 to 0.3% Zr, 0.03 to 0.3% Si as well as ≤0.5% Zr and Si, 0.03 to 1.0% Fe, ≥99.5% total content of Al and the above Fe and the balance Al with inevitable impurities is prepd. At the time of manufacturing a fin material for a heat exchanger by subjecting the above alloy to hot rolling, subsequent cold rolling and annealing, in the hot rolling, rolling from 120mm to a finish sheet thickness is executed by ≥8 passes, and process annealing is executed at 320 to 450°C at 20 to 85% final cold draft to manufacture an aluminum alloy fin material particularly excellent in heat conductivity.