PROBLEM TO BE SOLVED: To provide a seedling transplanter securing a working space on the machine and enabling to place maximum mat seedlings for supply.SOLUTION: The seedling transplanter is composed of: a traveling vehicle body including a driving seat for riding a transplantation part for liftably planting seedlings in multiple rows at a rear side thereof and a preparatory seedling frame composed of multiple stages of platforms 38a and 38b for placing a mat seedling M in a seedling tray for supply at a side part of the traveling vehicle body. A supplementary platform 101 movably supporting the platforms 38a and 38b of the preparatory seedling frame with parallel links 39a and 39b up to a serial deployed position in a back and forth direction, and capable of placing the mat seedling M for supply on one of the right and left sides of the whole platforms 38a and 38b or a part thereof are arranged in parallel.COPYRIGHT: (C)2012,JPO&INPIT【課題】機上の作業スペースを確保しつつ、最大限の補給用マット苗を載せることが可能な苗移植機を提供する。【解決手段】苗移植機は、乗用操縦席を備えた走行車体と、その後側で昇降可能に苗を多条に植え付ける移植部と、走行車体の側部に苗箱入りの補給用マット苗Mを載せる苗載台38a,38bを多段に構成した予備苗枠とを備えて構成され、予備苗枠の苗載台38a,38bを前後方向に直列する展開位置まで平行リンク39a,39bで可動支持し、全苗載台38a,38bまたはその一部の左右一側に補給用マット苗Mを載置可能な補助苗載台101を並列配置した。【選択図】図10