Thermally conductive composite material

A thermally conductive composite material comprising:

• a matrix;
• and
• a thermally conductive filler that is dispersed in the matrix,
• wherein the thermally conductive filler is a mixture including boron nitride particles with an average particle size of 10 μm to 100 μm and aluminum nitride particles with an average particle size that is 1/100 to ½ of the average particle size of the boron nitride particles,
• wherein a content of the boron nitride particles is 60 volume % to 90 volume % with respect to a total amount of the boron nitride particles and the aluminum nitride particles,
• wherein a content of the thermally conductive filler is 80 volume % to 95 volume % with respect to a total amount of the composite material, and
• wherein a porosity of the composite material is 6.5 volume % or more and 10 volume % or less.