PROBLEM TO BE SOLVED: To provide a seedling transplanter allowing a worker to switch between "a spread state" and "a stored state" without requiring any labor, prevented from interrupting any other work even during switching work, and improving working efficiency.SOLUTION: The seedling transplanter includes: preliminary seedling trays being switchable between "a spread state" where first to third preliminary seedling trays 38a-38c are aligned in a longitudinal row, and "a stored state" where the first to third preliminary seedling trays are vertically aligned in multiple rows, by first to third moving link members 39a-39c a turning gear 300g that, when drive force is applied thereto, rotationally turns the first to third moving link members 39a-39c about turning shafts ax1 and ax2 a switching motor 300m for applying drive force to the turning gear 300g a preliminary seedling tray switch for detecting presence/absence of seedling boxes placed on the first to third preliminary seedling trays 38a-38c and a microcomputer for switching reception of actuation operation of the switching motor 300m according to a detection result of the preliminary seedling tray switch.COPYRIGHT: (C)2015,JPO&INPIT【課題】作業者が労力を費やすことなく「展開状態」と「収納状態」との切り替えを行うことができ、切替作業中であっても他の作業を中断せずにすみ、作業能率を向上することが可能な苗移植機を提供する。【解決手段】第1~3予備苗載台38a~38cが前後一列に並んだ「展開状態」と、上下多段に並んだ「収納状態」とを第1~3移動リンク部材39a~39cにより切替可能な予備苗載台と、駆動力が与えられると、回動軸ax1,ax2を中心に第1~3移動リンク部材39a~39cを回動させる回動ギア300gと、回動ギア300gに駆動力を与える切替モータ300mと、第1~3予備苗載台38a~38cに積載された苗箱の有無を検知する予備苗載台スイッチと、予備苗載台スイッチの検知結果に応じて切替モータ300mの作動操作の受付を切り替えるマイコンとを設けた。【選択図】図9