The present disclosure provides a seedling transplanter that prevents excess fertilizer consumption and the occurrence of unfertilized regions, so as to perform proper fertilization operations and to improve fertilization operability. A seedling planting portion is liftably disposed at a rear portion of a traveling vehicle body. A float is provided on the seedling planting portion and is in contact with the surface of a farm field. A fertilizing device is provided to supply fertilizers upon the farm field. An angle detection component is provided to detect the rotation angle of the float. A rotation interlocking mechanism is comprised for interlocking the rotation of the traveling vehicle body and switching the lifting of the seedling planting portion and the actuation of the seedling planting portion and the fertilizing device. A fertilizing transmission on-off member (422) is provided to switch the actuation of the fertilization device. A control device is provided to switch the fertilizing transmission on-off member (422) to a connected state when the rotation angle detected by the angle detection device is within a predetermined angle range due to the descend of the seedling planting portion via the rotation interlocking mechanism.本發明係提供一種苗移植機，係防止消耗多餘的肥料、防止產生未供給肥料的區間、進行適當的施肥作業、提高施肥的作業性。在行進車體的後部以升降自如的方式設置苗栽種部；在苗栽種部設置與農田面接觸的浮動體；設置對農田供給肥料的施肥裝置；設置檢測浮動體的轉動角度的角度檢測構件；具備與行進車體的旋轉連動地切換苗栽種部的升降以及苗栽種部與施肥裝置的作動的旋轉連動機構；設置對施肥裝置的作動進行接通/斷開的施肥傳動接通/斷開構件(422)；設置控制裝置，當苗栽種部藉由旋轉連動機構下降而使角度檢測構件的檢測角度成為預定角度範圍內時，使施肥傳動接通/斷開構件(422)處於接通狀態。
