To prevent erroneous operation by providing a flash memory and a terminal for rewriting a program on a communication line and connecting the terminal with connector or covering the terminal with a cover thereby eliminating noise onto a signal line.

A rotatable transporting trough and a top plate are disposed above the machine wall of a drying machine and a grain storing chamber is formed under the machine wall. When a program is rewritten by the grain temperature detected by a grain temperature sensor, an external communication line 40, i.e., a connector 41, is inserted into a rewriting terminal 42 and connected therewith. When grains are dried by mounting an operating unit 14 onto the machine wall of the drying machine, a connector 39 is fixed to the fixing region of the terminal 42 and a substantially box-type cover 44 is fixed to the terminal 42 in the region for fixing the connector 41. According to the arrangement, open circuit and short circuit of signal line and erroneous function due to induction noise of the signal line can be prevented.