PROBLEM TO BE SOLVED: To provide a riding type paddy field working machine excellent in durability by heightening the strength of a mounting member for link members coupled with a rear wheel shaft case which enables the right and left rear wheels to rise and fall simultaneously and individually.SOLUTION: A rear wheel supporting device 2R is formed in combination of a suspension supporting mechanism 32a to elastically support the rear wheel shaft case 28 supporting a pair of right and left rear wheels 2, on the right and left sides, with a first link member 30 which couples the rear wheel shaft case 28 to a machine body fixing part located ahead and restricts the fore-and-aft motions of the rear wheel shaft case 28 while its vertical motions are admitted, and further a second link member 40 to restrict the left-right motions of the rear wheel shaft case is provided over the range between the machine body fixing part and the rear wheel shaft case 28, wherein the link mounting member 50 for coupling the first rink member 30 or the second link member 40 to the machine body fixing part is formed from a prism-shaped member furnished with an opening 53 for coupling in a place where the first and second link members 30, 40 are coupled together.COPYRIGHT: (C)2009,JPO&INPIT【課題】 後車輪の左右同時昇降及び左右各別昇降が可能な後車軸ケースに連結されるリンク部材の取付部材の強度を高めて、耐久性に優れた乗用水田作業機を提供する。【解決手段】後輪支持装置2Rを、左右一対の後輪2を支持する後車軸ケース28を左右両側で弾性支持するサスペンション支持機構32aと、後車軸ケース28を前方側の機体固定部に連結して後車軸ケース28の上下方向移動は許しながら前後方向移動を制限する第1リンク部材30との組み合わせで構成し、機体固定部と後車軸ケース28とにわたって、後車軸ケースの左右方向移動を制限する第2リンク部材40を設け、前記第1リンク部材30、又は第2リンク部材40を機体固定部に連結するためのリンク取付部材50を、第1,第2リンク部材30,40の連結箇所に連結用開口部53を備えた角筒状部材によって構成してある。【選択図】 図3
