Provided are aluminum nitride crystal grains in which each individual grain has a grain size of 0.05 µm to 1 µm and a shape selected from any of a hexagonal prism, a hexagonal drum shape, a hexagonal pyramid, or two hexagonal pyramids where the base surfaces thereof are joined together. A production device (1A) comprises: a first reaction chamber (7a) for generating aluminum chloride gas by reacting hydrogen chloride gas and aluminum heated to a temperature that is the melting point of the aluminum or lower; a second reaction chamber (2a) for growing aluminum nitride crystal grains by reacting ammonia gas and the aluminum chloride gas; a heater (3) for heating the first reaction chamber (7a) and the second reaction chamber (2a); and a shroud (9) for separating the ammonia gas and the aluminum chloride gas up to the second reaction chamber (2a). As a result, a device for producing aluminum nitride crystal grains can be provided with which aluminum nitride crystal grains that are single crystals can be efficiently produced.
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