PROBLEM TO BE SOLVED: To provide a paddy field working machine capable of being switched to a state in which appropriate ground levelling capability can be exhibited by a ground levelling device according to the difference in various working conditions.SOLUTION: The rotary ground levelling device which is driven to rotate around a horizontal axis between a travelling machine body and a working device includes a large-diameter ground-levelling rotator 62A and a small-diameter ground-levelling rotator 62B. The small-diameter ground-levelling rotator 62B is disposed in a region corresponding to the machine body front side of a sensor float 9. A ground-levelling control means is configured to be switched to a first control state in which the lower end t1 of the small-diameter ground-levelling rotator 62B is located higher than the bottom position t2 of the sensor float 9, or to a second control state in which the lower end t1 is located at the same height as the bottom position t2, or to a third control state in which the lower end t1 of the small-diameter ground-levelling rotator 62B is located lower than the bottom position t2 of the sensor float 9.COPYRIGHT: (C)2012,JPO&INPIT【課題】種々の作業状況の違いに応じて整地装置により適切な整地性能を発揮できる状態に切り換えることが可能となる水田作業機を提供する。【解決手段】走行機体と作業装置との間に横軸芯周りで駆動回転される回転式の整地装置が大径の整地用回転体62Aと小径の整地用回転体62Bとを備え、且つ、センサフロート9の機体前方側に対応する領域に小径の整地用回転体62Bを備えて構成され、整地制御手段が、小径の整地用回転体62Bの下端部t1をセンサフロート9の底面位置t2よりも上方に位置させる第1制御状態、それらを同じ高さに位置させる第2制御状態、小径の整地用回転体62Bの下端部t1をセンサフロート9の底面位置t2よりも下方に位置させる第3制御状態の夫々に切り換え可能に構成される。【選択図】図17
