PROBLEM TO BE SOLVED: To provide a seedling transplanter in which a seedling supplementation work area on the transplanter can be secured when extending a switchover preliminary seedling frame to the seedling to be supplemented on a levee top to load, or loading distance of the seedling to be supplemented to the right and left switchover preliminary seedling frames can be decreased.SOLUTION: A seedling transplanter comprises: a seedling planting unit by which a seedling is planted on a field a switchover preliminary seedling frame in which a plurality of preliminary seedling mounting members accommodating the seedlings to be supplemented is switchable between a laminate form having vertical arrangement and an extension form having tandem arrangement in the front side by a turning link mechanism and a turning support mechanism 85g which pivotally supports the switchover preliminary seedling frame in the given array direction. The turning support mechanism 85g includes a linkage turning mechanism 85f, 86a so that the given array direction is turned in conjugation with extension movement of the switchover preliminary seedling frame.SELECTED DRAWING: Figure 4COPYRIGHT: (C)2016,JPO&INPIT【課題】畦上の補充苗に切替予備苗枠を延ばして積込む際に、車上の苗補充作業域を確保し、または、左右の切替予備苗枠までの補充苗の積込み距離を小さくすることができる苗移植機を提供する。【解決手段】苗移植機は圃場に苗を植え付ける苗植付部と、補充苗を収容する複数の予備苗載部材を回動リンク機構によって上下配置の積層形態と前側に直列配置の展開形態とを切替え可能に構成した切替予備苗枠と、この切替予備苗枠の配置方向を回動可能に軸支する回動支持機構85gとを備えて構成され、回動支持機構85gには連動回動機構85f,86aを備えることにより、切替予備苗枠の展開動作と連動して配置方向を回動する。【選択図】図4