PROBLEM TO BE SOLVED: To regulate the invasion of mud from the outside when forming a marker trace on a soil surface while having a simple and lightweight cover structure, and to easily prevent soil scattering when switching to a storage posture. A marker device for a transplanting machine is provided. SOLUTION: A rotating body marker 26 that rotatably supports the planting work device 6 via an arm mounting portion 17 and an arm 19 is drawn by forming a marker trace on a field soil surface and serving as an index of traveling. A marker device for a work vehicle including a marker device 10 that can be freely switched between a working posture and a retracted posture in which the rotating body marker 26 is separated from the soil surface and placed in a sideways state based on the upward standing motion of the arm 19. A cover body 29 that covers at least the entire inner circumference and outer side of the ring portion 28c is provided on the outer side of the rotating body marker 26 of the marker device 10. [Selection diagram] Fig. 5【課題】簡潔軽量な安価型のカバー構造でありながら土壌面にマーカ跡を形成する際に、外方側からの泥土の侵入を規制すると共に、格納姿勢への切換時に土飛散を防止し易くする移植機のマーカ装置を提供する。【解決手段】植付作業装置６にアーム取付部１７及びアーム１9を介して接地回転自在に支持する回転体マーカ２６を、圃場土壌面にマーカ跡を形成して走行の指標になる線引きを行う作業姿勢と、アーム１９の上方起立動作に基づき回転体マーカ２６を土壌面から離間し横向き状態にする格納姿勢とに切換自在に構成するマーカ装置１０を備える作業車両のマーカ装置であって、前記マーカ装置１０の回転体マーカ２６の外方面側に、少なくともリング部２８ｃの内周外方の全面を覆うカバー体２９を備える構成にした。【選択図】図５
