ALUMINUM NITRIDE POWDER AND PRODUCTION METHOD THEREFOR

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Provided is an aluminum nitride powder which is less likely to aggregate in a sintering step even without using boron nitride as a raw material. This aluminum nitride powder contains oxygen and a rare-earth element, and is characterized in that the aluminum nitride powder has an apparent density of 3.2 g/cm3 or higher, the contained amount of the oxygen is 0.01-1 mass% with respect to 100 mass% of the aluminum nitride powder, and the mass ratio (MR/MO) of the contained amount (MR) of the rare-earth element to the contained amount (MO) of the oxygen is 0.1-1.5.