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PROBLEM TO BE SOLVED : To provide a high-toughness magnesium-base alloy having excellent tensile strength, fracture elongation and fatigue strength at ordinary temperature and also having high heat-resistant strength characteristics at about 200°C. SOLUTION : The high-toughness magnesium-base alloy contains, by weight, 1 to 8% rare earth element and 1 to 6% calcium, and further, the maximum grain size of magnesium constituting a matrix is made to ≤30μm. The maximum grain size of an intermetallic compound 6 of at least either of the rare earth element and calcium is made to ≤20μm, and this intermetallic compound is dispersed in the grain boundaries 5 and grains 4 of the magnesium constituting the matrix. COPYRIGHT : (C)2006, JPO&NCIPI