Sn based alloy having improved mechanical property

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Provided is an Sn-based alloy with improved mechanical properties. The Sn-based alloy is an alloy having a composition indicated by the chemical formula 1 below. [Chemical formula 1] (Sn_aM^1_bM^2_c)_(100-x)A_x; where (a+b+c=100, 30<=a<=40, 30<=b<=40, 30<=c<= 40, 0<=x<=10). In chemical formula 1, M^1 and M^2 are different metals. The M^1 or M^2 is the metal of which a melting point is the same with a melting point of Al or lower. In addition, A is Ca or a misch metal. The purpose of the present invention is to provide the Sn-based alloy with improved mechanical properties including strength.