Problem to be solved. To provide a granular grain processing apparatus which is inexpensive and can continuously perform processing such as cooking, gelatinization, roasting and puffing at low output and low energy with granular grain put in the apparatus, and provide a granular grain processing method using the same. Solution. A granular grain processing apparatus comprises: a pressure-resistant cylindrical pot which is rotatable in the circumferential direction; a heating device which heats the pressure-resistant cylindrical pot; a valve mechanism which is attached to the pressure-resistant cylindrical pot and has a pressure adjustment and steam discharge function in the pressure-resistant cylindrical pot; at least one longitudinal-directional agitation blade which is provided in the pressure-resistant cylindrical pot and in the longitudinal direction of the pressure-resistant cylindrical pot and agitates the content; and a driving device which rotates the pressure-resistant cylindrical pot. The pressure-resistant cylindrical pot is rotated at a rotational speed indicating...

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