A probe pin material comprising a Ag-Pd-Cu-based alloy comprising: Ag, Pd and Cu; B as a first additive element; at least any element of Zn, Bi and Sn as a second additive element, and unavoidable impurities, wherein the total concentration of Ag, Pd, Cu, the first additive element, the second additive element, and the unavoidable impurities is 100 mass%, when based on a total value of a Ag concentration, a Pd concentration and a Cu concentration in the Ag-Pd-Cu-based alloy, the Ag concentration, the Pd concentration and the Cu concentration are respectively converted into a Ag concentration S Ag , a Pd concentration S Pd and a Cu concentration S Cu in a Ag-Pd-Cu ternary alloy, all the S Ag , the S Pd and the S Cu fall within a range of a polygon A1-A2-A3-A4 surrounded with straight lines connecting respective points of a point A1 being defined as Ag: 5.5 mass%, Pd:47.5 mass%, Cu:47 mass%, a point A2 being defined as Ag: 5.5 mass%, Pd:58.5 mass%, Cu:36 mass%, a point A3 being defined as Ag: 18 mass%, Pd:49 mass%, Cu:33 mass% and a point A4 being defined as Ag: 18 mass%, Pd:45 mass%, Cu:37 mass% in a Ag-Pd-Cu ternary system phase diagram, a concentration of the first additive element is 0.1 mass% or more and 1.5 mass% or less, and a concentration of the second additive element is 0.1 mass% or more and 1.0 mass% or less, wherein in the procedure of the conversion into S Ag , S Pd and S Cu , a coefficient K, defined as 100 / (the total value of the Ag concentration, the Pd concentration and the Cu concentration in the Ag-Pd-Cu-based alloy), is multiplied with the Ag concentration, the Pd concentration and the Cu concentration in the Ag-Pd-Cu-based alloy to thereby respectively provide S Ag , S Pd and S Cu . wherein the total concentration of Ag, Pd, Cu, the first additive element, the second additive element, and the unavoidable impurities is 100 mass%, when based on a total value of a Ag concentration, a Pd concentration and a Cu concentration in the Ag-Pd-Cu-based alloy, the Ag concentration, the Pd concentration and the Cu concentration are respectively converted into a Ag concentration S Ag , a Pd concentration S Pd and a Cu concentration S Cu in a Ag-Pd-Cu ternary alloy, all the S Ag , the S Pd and the S Cu fall within a range of a polygon A1-A2-A3-A4 surrounded with straight lines connecting respective points of a point A1 being defined as Ag: 5.5 mass%, Pd:47.5 mass%, Cu:47 mass%, a point A2 being defined as Ag: 5.5 mass%, Pd:58.5 mass%, Cu:36 mass%, a point A3 being defined as Ag: 18 mass%, Pd:49 mass%, Cu:33 mass% and a point A4 being defined as Ag: 18 mass%, Pd:45 mass%, Cu:37 mass% in a Ag-Pd-Cu ternary system phase diagram, a concentration of the first additive element is 0.1 mass% or more and 1.5 mass% or less, and a concentration of the second additive element is 0.1 mass% or more and 1.0 mass% or less, wherein in the procedure of the conversion into S Ag , S Pd and S Cu , a coefficient K, defined as 100 / (the total value of the Ag concentration, the Pd concentration and the Cu concentration in the Ag-Pd-Cu-based alloy), is multiplied with the Ag concentration, the Pd concentration and the Cu concentration in the Ag-Pd-Cu-based alloy to thereby respectively provide S Ag , S Pd and S Cu . <EOS>