A hot-dip Al-Zn alloy coated steel sheet comprising: a base steel sheet; and a hot-dip coating on a surface of the base steel sheet, the hot-dip coating comprising an interfacial alloy layer existing in the interface with a base steel sheet, and an upper layer existing on the interfacial alloy layer, the upper layer having a composition consisting of Al in an amount of 20 mass% to 95 mass%, Si in an amount of 10 % or less of the Al content, at least one of Ca and Mg, the total content of Ca and Mg being 0.01 mass% to 10 mass%, optionally at least one of Mn, V, Cr, Mo, Sr, Ni, Co, and Sb in a total of 0.01 mass% to 10 mass%, and the balance being Zn and incidental impurities, wherein the mean Vickers hardness of the hot-dip coating is 50 Hv to 100 Hv, the mean Vickers hardness being determined as follows: the cross section of the hot-dip coating of a sample hot-dip Al-Zn alloy coated steel sheet is polished, then the Vickers hardness of twenty arbitrary areas on the upper layer side of the hot-dip coating is measured with a load of 5 g using a micro Vickers hardness gauge, and the mean value of the twenty areas measured is calculated, and wherein the mean size of spangles of the hot-dip coating is 0.5 mm or less, the mean size of spangles being determined as follows: a sample hot-dip Al-Zn alloy coated steel sheet is observed under an optical microscope by imaging the coated surface, then ten arbitrary straight lines of 10 mm are drawn over the photographs of the coated surface, and the numbers of spangles crossing the straight lines are counted to calculate the length per spangle, i.e. the spangle size. a base steel sheet; and a hot-dip coating on a surface of the base steel sheet, the hot-dip coating comprising an interfacial alloy layer existing in the interface with a base steel sheet, and an upper layer existing on the interfacial alloy layer, the upper layer having a composition consisting of Al in an amount of 20 mass% to 95 mass%, Si in an amount of 10 % or less of the Al content, at least one of Ca and Mg, the total content of Ca and Mg being 0.01 mass% to 10 mass%, optionally at least one of Mn, V, Cr, Mo, Sr, Ni, Co, and Sb in a total of 0.01 mass% to 10 mass%, and the balance being Zn and incidental impurities, wherein the mean Vickers hardness of the hot-dip coating is 50 Hv to 100 Hv, the mean Vickers hardness being determined as follows: the cross section of the hot-dip coating of a sample hot-dip Al-Zn alloy coated steel sheet is polished, then the Vickers hardness of twenty arbitrary areas on the upper layer side of the hot-dip coating is measured with a load of 5 g using a micro Vickers hardness gauge, and the mean value of the twenty areas measured is calculated, and wherein the mean size of spangles of the hot-dip coating is 0.5 mm or less, the mean size of spangles being determined as follows: a sample hot-dip Al-Zn alloy coated steel sheet is observed under an optical microscope by imaging the coated surface, then ten arbitrary straight lines of 10 mm are drawn over the photographs of the coated surface, and the numbers of spangles crossing the straight lines are counted to calculate the length per spangle, i.e. the spangle size. the cross section of the hot-dip coating of a sample hot-dip Al-Zn alloy coated steel sheet is polished, then the Vickers hardness of twenty arbitrary areas on the upper layer side of the hot-dip coating is measured with a load of 5 g using a micro Vickers hardness gauge, and the mean value of the twenty areas measured is calculated, and wherein the mean size of spangles of the hot-dip coating is 0.5 mm or less, the mean size of spangles being determined as follows: a sample hot-dip Al-Zn alloy coated steel sheet is observed under an optical microscope by imaging the coated surface, then ten arbitrary straight lines of 10 mm are drawn over the photographs of the coated surface, and the numbers of spangles crossing the straight lines are counted to calculate the length per spangle, i.e. the spangle size.