PROBLEM TO BE SOLVED: To level traveling traces of auxiliary wheels, and to enhance the planting accuracy of seedlings, in a seedling transplanter which is attached with the auxiliary wheels and enhanced in traveling performance.SOLUTION: A seedling transplanter comprises: a seedling tank 11 arranged at a rear side of a traveling vehicle body 6 so as to be turnable a seedling planter 13 for planting seedlings loaded in the seedling tank 11 into a farm field a center float 14 arranged at a lower part of the seedling tank 11 side floats 15, 15 located at left and right both sides of the seedling tank and outer floats 16, 16 located outside the side floats 15, 15. Left and right auxiliary rear wheels 19, 19 are arranged outside left and right rear wheels 5, 5 of the traveling vehicle body 6, the left and right auxiliary wheels 19, 19 are arranged so as to oppose intervals A between the side floats 15, 15 and the left and right outer floats 16, 16, and leveling plates 20, 20 for leveling passing traces of the left and right auxiliary rear wheels 19, 19 passing through the intervals A are arranged inside the left and right outer floats 16, 16, respectively.COPYRIGHT: (C)2015,JPO&INPIT【課題】補助車輪を装着して走行性を高めた苗移植機において、補助車輪の走行跡を均し、苗の植付精度を高めることを課題とする。【解決手段】走行車体6の後側部に回動自在に苗タンク11を設け、苗タンク11に積載された苗を圃場に植え付ける苗植付装置13を設け、苗タンク11の下部にセンタフロート14と、左右両側部のサイドフロート15,15と、サイドフロート15,15の外側部に位置するアウタフロート16,16を設けた苗移植機において、走行車体6の左右の後輪5,5の外側に左右の補助後輪19,19を設け、左右の補助後輪19,19をサイドフロート15,15と左右のアウタフロート16,16との間の間隔部Aに対向させて設け、左右のアウタフロート16,16の内側には、この間隔部Aを通過する左右の補助後輪19,19の通過後を均す均しプレート20,20を各々設ける構成とする。【選択図】 図3