PROBLEM TO BE SOLVED: To solve problems in turning operation: an operator must operates on-off operations of a working implement and ascending/descending operations of the working implement in addition to the turning operation of the machine body, therefore the operator can not concentrate to the turning operation.SOLUTION: A controller 170 is installed to a riding type seedling transplanter. The controller 170 outputs a command to raise a seedling transplanting implement 3 when lateral front wheels 6 are steered over a predetermined angle, calculates a travel distance by travel distance-calculating means and outputs a command to descend the seedling transplanting implement 3 depending on the travel distance to carry out an automatic turning control, and changes over to a state carrying out no automatic turning control by operating to stop the action of a marker 195 for lateral line-drawing of a marker action controlling device 220.COPYRIGHT: (C)2007,JPO&INPIT【課題】旋回時に、操縦者は機体の旋回操向操作以外に、作業装置の駆動の入り切り操作や作業装置の上昇・下降操作をしなければならず、旋回時の操向操作に専念できず、未だ、旋回操作性の点において課題があった。【解決手段】左右前輪6を所定角度以上に操向操作すると苗移植作業装置3を上昇させる指令を出力して苗移植作業装置3を上昇させ、且つ、走行距離算出手段にて走行距離を算出して、該走行距離に応じて苗移植作業装置3が下降する指令を出力する自動旋回制御を行なうと共に、マーカ作動操作具220の左右線引きマーカ195の作動を停止させる操作にて該自動旋回制御を行わない状態に切り替える制御装置170を設けた乗用型苗移植機。【選択図】図6
