PROBLEM TO BE SOLVED: To dispose a mobile preliminary seedling frame capable of being operated from the upper side or outer side of a travel vehicle body on the travel vehicle body to improve operation efficiency on works for loading or unloading seedlings.SOLUTION: A seedling transplanter is characterized by having a travel vehicle body 2, a seedling-planting device 3, a control device 60 for operating the travel vehicle body 2 and the like by a worker, and preliminary seedling frames 81, 82 which are arranged on the right and left sides of the control device 60 and has a plurality of preliminary seedling-loading tables 81a, 81b, 82a, 82b for supply seedlings, wherein one preliminary seedling frame 81 is a mobile preliminary seedling frame having a switching operation portion capable of switching the preliminary seedling-loading tables 81a, 81b into a lamination form for arranging the preliminary seedling-loading tables 81a, 81b in the vertical direction of the machine frame or into a developed form for arranging in the longitudinal direction of the machine frame the other preliminary seedling frame 82 is a fixed type preliminarily seedling frame for arranging and fixing the preliminary seedling-loading tables 82a, 82b in the vertical direction of the machine frame in an equal distance the switching operation portion has a main operation member 86a which enables to perform a switching operation from the upper side of the travel vehicle body 2 and an auxiliary operation member 86b which enables to perform a switching operation from the front side of the travel vehicle body 2.COPYRIGHT: (C)2014,JPO&INPIT【課題】走行車体の上又は外から操作可能な可動式の予備苗枠を走行車体に設け、苗の積み下ろし作業時の作業能率を向上させる。【解決手段】走行車体2と、苗植付装置3と、作業者が走行車体2等を操作する為の操縦装置60の左右夫々に配設され、補給苗用の複数の予備苗載せ台81a,81b,82a,82bを備えた予備苗枠81,82と、を有し、一方の予備苗枠81は、予備苗載せ台81a,81bが機体上下方向に並ぶ積層形態と機体前後方向に並ぶ展開形態とに切り替え可能な切り替え操作部を有する可動式予備苗枠であり、他方の予備苗枠82は、予備苗載せ台82a,82bを機体上下方向に等間隔に並べて固定配置した固定式予備苗枠であり、切り替え操作部は、走行車体2の上から切り替え操作が可能な主操作部材86aと、走行車体2の前方から切り替え操作が可能な補助操作部材86bと、
