PROBLEM TO BE SOLVED: To prevent a change in vehicle height over time. SOLUTION: A front wheel 45 and a rear wheel 44 provided on a traveling vehicle body 40, a rotatable traveling transmission case 38 for transmitting a driving force to the rear wheel 44, and a traveling transmission case 38 are rotated. A vehicle height adjusting mechanism 100 for adjusting the vehicle height, a planting device 42 provided on the traveling vehicle body 40 for planting vegetable seedlings, and a vehicle height adjusting mechanism 100 for restricting a change in the vehicle height adjusted with time. The vehicle height maintenance device 1000 is provided, and the regulation of the vehicle height change is performed by the first vehicle height maintenance device 1000 regulating the movement of the vehicle height adjustment mechanism 100. Is. [Selection diagram] Fig. 5【課題】車高の時間経過による変化を防止すること。【解決手段】走行車体４０に設けられた前輪４５及び後輪４４と、後輪４４に駆動力を伝動する、回動可能な走行用伝動ケース３８と、走行用伝動ケース３８を回動させて車高を調節する車高調節機構１００と、走行車体４０に設けられ、野菜苗を植え付ける植付装置４２と、車高調節機構１００により調節された車高の時間経過による変化を規制する第１車高維持装置１０００と、を備え、車高の変化の規制は、第１車高維持装置１０００が車高調節機構１００の動きを規制することにより行われる、ことを特徴とする苗移植機１である。【選択図】図５
