PROBLEM TO BE SOLVED: To surely hold a posture in a state where a marker is switched to an ascending non-acting posture. SOLUTION: The seedling planting device is supported so as to be able to change the posture between an action posture of forming a running index at a position in contact with the field scene and a rising non-action posture of swinging to the ascending side and away from the field scene. The left and right markers 28 and a holding member 65 that prevents the marker 28 from moving to the descending side in an ascending non-acting posture are provided, and the holding member 65 receives the marker 28 and prevents the marker 28 from moving to the descending side. A receiving portion 66 is provided, and a narrow disconnection preventing portion 67 is provided to prevent the marker 28 from coming off to the ascending side while being received by the receiving portion 66. [Selection diagram] FIG. 11【課題】マーカを上昇非作用姿勢に切り換えた状態で確実に姿勢保持することができるようにすることが要望されていた。【解決手段】苗植付装置に、圃場面に接地した位置で走行指標を形成する作用姿勢と、上昇側に揺動して圃場面から離れた上昇非作用姿勢とに姿勢変更可能に支持された左右のマーカ２８と、マーカ２８を上昇非作用姿勢にて下降側への移動を阻止する保持部材６５とが備えられ、保持部材６５は、マーカ２８を受止めて下降側への移動を阻止する受止め部６６と、受止め部６６にて受止めた状態でマーカ２８の上昇側への抜け外れを阻止する幅狭の抜け外れ防止部６７とを備えている。【選択図】図１１
