To prevent discharge operation from being performed when a discharge instruction is issued by mistake.

This dryer is adapted such that when there is a discharge instruction of grains 2A, 2B from a grain container 1 with a discharge button 9 there are compared a target water content being a water content value which is a drying target of the grains 2A, 2B with a detection water content value detected by water content measurement means, and when a difference between the target water content value and the detection water content value is larger than a predetermined range, operation of a discharge gate 10 for grain discharge is restricted. Thereby, even when a discharge instruction is performed with the push button 9 by mistake, the discharge operation is not done unless the difference between the target water content value and the detection water content value is within the predetermined range.