This rice huller (1) comprises: a pair of a first husking roller (12) and a second husking roller (13); a first driven pulley (8) and a second driven pulley (9) that are provided to both of the rollers (12, 13) so as to rotate integrally therewith; and a control unit (20) that, when a first rotational frequency sensor (17) and a second rotational frequency sensor (18) detect that a flat belt (11) has slid with respect to the driven pulleys (8, 9), controls a gap adjusting mechanism (10) such that a gap GA between the rollers (12, 13) becomes bigger.

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