PROBLEM TO BE SOLVED: To provide a seedling transplanter which can be switched into [developed state] or [stored state] without spending the labor of a worker and can improve the efficiency of work even during a switching work without interrupting other work.SOLUTION: The preliminary seedling-loading trays capable of being switched into [developed state] where first to third preliminary seedling-loading trays 38a to 38c are arranged in a longitudinal line or [stored state] where the preliminary seedling-loading trays are vertically arranged at multi-stages, with first to third moving link members 39a to 39c, a rotation gear 300g for rotating the first to third moving link members 39a to 39c on rotation axes ax1, ax2, when a driving force is given, a switching motor 300m for giving the driving force to the rotation gear 300g, a preliminary seedling-loading tray switch for detecting the presence or absence of a seedling box loaded on the preliminary seedling-loading trays 38a to 38c, and a microcomputer for switching the reception of the working operation of the switching motor 300m according to the detection result of the preliminary seedling-loading tray switch are disposed.COPYRIGHT: (C)2012,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