An aluminum-coated blank comprising two or more aluminum-coated steel sheets connected together by a joint, each of the aluminum-coated steel sheets comprising: a base steel sheet comprising an amount of 0.01 to 0.5 wt% of carbon, an amount of 0.01 to 1.0 wt% of silicon (Si), an amount of 0.5 to 3.0 wt% of manganese (Mn), an amount greater than 0 wt% and not greater than 0.05 wt% of phosphorus, an amount greater than 0 wt% and not greater than 0.1 wt% of aluminum (Al), an amount greater than 0 but not greater than 0.01 wt% of sulfur, an amount greater than 0 but not greater than 0.001 wt% of nitrogen and the balance of iron (Fe) and other inevitable impurities, based on the total weight of the base steel sheet; and a coating layer comprising aluminum (Al) and formed on at least one surface of the base steel sheet in a coating weight of 20 to 100 g/m 2, wherein the joint comprises a composition comprising an amount of 0.2 to 2.0 wt% of aluminum (Al) based on the total weight of the composition, wherein the composition has a microstructure including 90 area% to 100 area% of martensite after a hot-stamping molding, wherein an average hardness of the joint is equal to or greater than an average hardness of the base steel sheet; characterized in that the base steel sheet further comprises one or more selected from the group consisting of niobium (Nb), titanium (Ti), chromium (Cr), molybdenum (Mo), and boron, wherein, when present in the base steel sheet, the amount of niobium (Nb) is of 0.005 to 0.1 wt%, the amount of titanium (Ti) is of 0.005 to 0.1 wt%, the amount of chromium (Cr) is of 0.01 to 0.5 wt%, the amount of molybdenum (Mo) is of 0.001 to 0.008 wt%, and the amount of boron is of 0.001 to 0.008 wt%. a base steel sheet comprising an amount of 0.01 to 0.5 wt% of carbon, an amount of 0.01 to 1.0 wt% of silicon (Si), an amount of 0.5 to 3.0 wt% of manganese (Mn), an amount greater than 0 wt% and not greater than 0.05 wt% of phosphorus, an amount greater than 0 wt% and not greater than 0.1 wt% of aluminum (Al), an amount greater than 0 but not greater than 0.01 wt% of sulfur, an amount greater than 0 but not greater than 0.001 wt% of nitrogen and the balance of iron (Fe) and other inevitable impurities, based on the total weight of the base steel sheet; and a coating layer comprising aluminum (Al) and formed on at least one surface of the base steel sheet in a coating weight of 20 to 100 g/m 2, wherein the joint comprises a composition comprising an amount of 0.2 to 2.0 wt% of aluminum (Al) based on the total weight of the composition, wherein the composition has a microstructure including 90 area% to 100 area% of martensite after a hot-stamping molding, wherein an average hardness of the joint is equal to or greater than an average hardness of the base steel sheet; characterized in that the base steel sheet further comprises one or more selected from the group consisting of niobium (Nb), titanium (Ti), chromium (Cr), molybdenum (Mo), and boron, wherein, when present in the base steel sheet, the amount of niobium (Nb) is of 0.005 to 0.1 wt%, the amount of titanium (Ti) is of 0.005 to 0.1 wt%, the amount of chromium (Cr) is of 0.01 to 0.5 wt%, the amount of molybdenum (Mo) is of 0.001 to 0.008 wt%, and the amount of boron is of 0.001 to 0.008 wt%.