Aluminium nitride sintered body and manufacturing method thereof

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An aluminum nitride sintered body with high heat conductivity and high strength as well as a method of inexpensively manufacturing such an aluminum nitride sintered body at a low temperature are provided. The aluminum nitride sintered body is manufactured by adding a compound of at least one type of rare earth element (R) selected from La, Ce, Pr, Sm, and Eu, Y compound, Ca compound, and A l compound to an A l N powder and sintering the resulting mixture at a temperature of 1550 DEG C to 1750 DEG C. The content of oxygen forming A l 2O3 existing in an aluminate with rare earth element (R), Y and Ca and oxygen forming independently existing A l 2O3 is calculated as 0.01 to 5.0% by weight, heat conductivity is 166 to 200W/mK, and bending strength is at least 300MPa.