Provided is a super elastic alloy for biological use having a high biocompatibility, good processability and super elasticity, said super elastic alloy being a super elastic zirconium alloy for biological use comprising 27-54 mol% inclusive of titanium, 5-9 mol% inclusive of niobium which is a ² phase-stabilizing element capable of stabilizing the ² phase of zirconium, and 1-4 mol% inclusive in total of tin and/or aluminum which are É phase-suppressing elements capable of suppressing the É phase of zirconium, with the balance consisting of zirconium and inevitable impurities.
