PROBLEM TO BE SOLVED: To prevent the slippage of a front wheel when going over a ridge, and to enable secure going-over of the ridge.SOLUTION: The riding-type rice transplanter 1 equipped with a vehicle-outside operation tool 12 for carrying out the traveling operation from the outside of the vehicle when going over the ridge, is equipped with a differential locking mechanism 29 for selectively locking the differential motion of the right and left front wheels 10, a clutch pedal-operation system for operating a clutch mechanism 13 and a braking mechanism 30 according to the operation of a clutch pedal 35, a synchronizing operation tool 52 operable to a synchronizing position or a synchronization-releasing position, a vehicle-outside operation tool-synchronizing mechanism 63 synchronizing the vehicle-outside operation tool 12 with the clutch pedal-operation system according to the synchronizing operation of the synchronizing operation tool 52, and enabling the operation of the clutch mechanism 13 and the braking mechanism 30 by the outside operation tool 12, and a differential locking-synchronizing mechanism 74 for automatically forming the differential locking mechanism 29 into a differential locking state according to the synchronizing operation of the synchronizing operation tool 52.COPYRIGHT: (C)2011,JPO&INPIT【課題】畦越え時の前輪スリップを防止し、確実な畦越えを可能にする。【解決手段】畦越え時に車外から走行操作を行うための車外操作具12を備える乗用型田植機1であって、左右の前輪10の差動を選択的にロックするデフロック機構29と、クラッチペダル35の操作に応じてクラッチ機構13及びブレーキ機構30を作動させるクラッチペダル操作系と、連係位置及び連係解除位置に操作可能な連係操作具52と、連係操作具52の連係操作に応じて車外操作具12をクラッチペダル操作系に連係させ、車外操作具12によるクラッチ機構13及びブレーキ機構30の操作を可能にする車外操作具連係機構63と、連係操作具52の連係操作に応じてデフロック機構29を自動的にデフロック状態にするデフロック連係機構74とを備える。【選択図】図8
