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PROBLEM TO BE SOLVED : To provide an LnFeAsO having high superconductivity transition temperature. SOLUTION : The superconductive material is the LnFeAsO (Ln is Y or rare earth) having strong ZrCuSiAs type crystal structure and has ≥106° to ≤113° As-Fe-As angle in an FeAs4 tetrahedron. When Ln is Nd, the angle of As-Fe-As is preferably ≤111° and when Ln is La, the angle of As-Fe-As is preferably ≤113°. COPYRIGHT : (C)2010, JPO&INPIT