An objective of the present invention is to provide a particulate body sterilization device with which it is possible to sterilize a large quantity of particulate bodies uniformly and without unevenness, as well as efficiently. A particulate body sterilization device (1) comprises: an intake (29) wherein a particulate body is received; a duct for sterilization (23), further comprising a sterilization processing space (37) for applying sterilizing electromagnetic waves on a particulate body flow (W1) which is received from the intake (29) and sterilization processing the particulate body flow (W1), and a discharge port (31) for discharging the particulate body which is sterilization processed in the sterilization processing space (37); an airflow generating device (9) which generates an air flow which flows through the sterilization processing space (37) from the intake (29) toward the discharge port (31), for conveying the particulate body flow (W1) from the intake (29) to the discharge port (31); and an airf
