To provide an aluminium nitride sintered compact which contains aluminium nitride particles difficult to degranulate, shows strong resistance of 10^8 Ω.cm or more at a high temperature zone of for example 300-500°C and has a relatively high thermal conductivity. 窒化アルミニウム粒子が脱粒しにくく、高温領域、例えば300〜500℃において10^8Ω・cm以上の高抵抗値を示し、熱伝導率も比較的高い窒化アルミニウム焼結体を提供すること。 - 特許庁