Boron nitride particle, boron nitride powder, resin composition, and resin composition production method

A hollow boron nitride particle having a long and thin shape,

• wherein a maximum length (La) of the boron nitride particle is 80 μm or longer,
• wherein a maximum length (Lb) of the boron nitride particle in the direction perpendicular to a direction of a maximum length (La) of the boron nitride particle is 50 μm or longer,
• wherein, when the hollow boron nitride particle is subjected to a loading and unloading test comprising a loading step and unloading step in this order, at least a part of a length in the lateral direction of the hollow boron nitride particle compressed in the loading step returns in the unloading step, wherein
• the loading step comprises gradually applying a load from 0.2 mN up to 20 mN at a loading rate of 0.27 mN/second in a lateral direction of the hollow boron nitride particle to compress the hollow boron nitride particle, and
• the unloading step comprises gradually unloading the hollow boron nitride particle to 0.2 mN at an unloading rate of 0.27 mN/second.