A shape memory alloy that excels in workability and permits repeated use at high temperature. There is provided a high-temperature shape memory alloy characterized by being composed of transformation temperature increasing additive elements containing 34.7 to 48.5 mol% nickel and at least one of zirconium and hafnium wherein the sum of zirconium and hafnium is in the range of 6.8 to 22.5 mol%; workability enhancing additive elements containing at least one of niobium and tantalum wherein the sum of niobium and tantalum is in the range of 1 to 30 mol%; 2 mol% or less boron; and the balance titanium and unavoidable impurities.