An aluminum alloy foil has a composition containing 1.0% to 1.8% by mass of Fe, 0.10% to 0.20% by mass of Si, 0.005% to 0.05% by mass of Cu, and Mn regulated to be 0.01% by mass or less, with the balance consisting of Al and incidental impurities. With regard to crystal grains surrounded by high inclination angle grain boundaries which are grain boundaries having a misorientation of 15° or more in analysis of crystal orientation per unit area using electron backscatter diffraction, an average grain size of the crystal grains is 10 μm or less, and a maximum grain size of the crystal grains/the average grain size of the crystal grains ≤3.0. When a thickness of the foil is 30 μm, elongations in directions making 0°, 45° and 90° with respect to a rolling direction are each 25% or more respectively.