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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(A1, A2) Production example 12(B1, B2, ) Production example11(C1, C2) Production example 10(D1, D2) Production example 9(E1, E2) Preparation example 8(F1, F2) Preparation example 7COPYRIGHT KIPO 2016