To reduce the frequency with which grains fall out from a pair of electrode rolls even when a pressing plate which presses a grain in between the pair of electrode rolls is used in a moisture measurement apparatus for measuring moisture value of grains.

A moisture measuring apparatus comprises: a pressing member 5 which presses a grain in between a pair of electrode rolls 1a and 1b; a link mechanism which converts the rotation of the electrode roll 1a into a swinging motion and makes the pressing member 5 swing; and a fall-out prevention plate 6 which prevents grains from falling out from between the pair of electrode rolls 1a and 1b. The fall-out prevention plate 6 is configured to be swung together with the pressing member 5 by the link mechanism so that it is not necessary to consider interference between the fall-out prevention plate 6 and the pressing member 5. Therefore, design flexibility of the shape of the fall-out prevention plate 6 increased so as to be able to cover the area near the pair of electrode rolls 1a and 1b and effectively prevent a supplied grain from falling out.