PROBLEM TO BE SOLVED: To provide a seedling transplanter, capable of supplying a fertilizer to an agricultural field in a normal manner.SOLUTION: A seedling transplanter includes: a seedling planting device 4 disposed on the rear side of a link mechanism 3, the planting device planting seedlings in an agricultural field; a lifting and lowering detection sensor 102 which detects a lifting or lowering position of the link mechanism 3; a height adjustment mechanism 25 which changes the height of the seedling planting device through the link mechanism; a delivery passage 62 for delivering a fertilizer from a fertilizer storage unit 60 onto the agricultural field surface; a groove forming member 64 provided on the front side of the outlet of the delivery passage 62, the member forming a groove in the agricultural field; a rotation detection sensor 104 which detects a traveling state of a traveling vehicle body; and a control unit 100 which lifts up the link mechanism by use of the height adjustment mechanism to separate the seedling planting device from the agricultural field surface, when the lifting and lowering detection sensor detects that the seedling planting device is located at an operation height for performing seedling planting operation, and the rotation detection sensor detects, continuously for a predetermined time or more, that the traveling body is in a stopped.【課題】圃場に肥料を正常に供給することが可能な苗移植機を提供すること。【解決手段】リンク機構3の後側に配置された、苗を圃場に植え付ける苗植え付け装置4と、リンク機構3の昇降位置を検出する昇降検出センサ102と、苗植え付け装置の高さをリンク機構により変更する高さ調節機構25と、肥料貯蔵部60から肥料を圃場面に放出する放出通路62と、放出通路62の出口の前側に設けられた、圃場に溝を形成する作溝部材64と、走行車体の走行状態を検出する回転検出センサ104と、昇降検出センサによって、苗植え付け装置が苗植え付け作業を行う作業高さに位置していることが検出され、回転検出センサによって走行車体が停止状態であることが所定時間以上継続して検出されると、高さ調節機構を用いて前記リンク機構を上昇させ、苗植え付け装置を圃場面から離間させる制御部100とを備えた、苗移植機である。【選択図】図1