To provide a device capable of securely brushing off and removing mud adhered to a blade plate parts and the both side parts of wheels at the low position of the wheel.

A mud brushing off plate 6 for brushing off the mud adhered to the blade plates 36 is oscillatably pivoted in the longitudinal direction of a rice transplanter 1 by contacting on the rotating preceding surface 38 of the blade plate 36 of the wheel 3 at the tip end part of the arm 5 connected to the rice transplanter 1 at the position of more front side of the rice transplanter 1 than the tip end part with an initial contact angle of acute angle at the tip end contact part 62, and the mud brush-off plate 6 is pivoted at the tip end of the arm 5 so as to return to the initial contact position by a coil spring 58 disposed at the tip end part of the arm 5.