PROBLEM TO BE SOLVED: To provide a seedling transplanter prevented from defect of leaking a hydraulic oil, even if a hydraulic valve is closed, from the inside of a hydraulic valve of a seedling planting device, not to elongate a lifting and hydraulic cylinder little by little and not to fall the seedling planting part.SOLUTION: There is provided a seedling transplanter freely liftably and lowerably having at a machine body rear part, a seedling planting part 4 carrying seedlings, equipping a seedling planting device 52 planting the seedlings on the farm field at a lower part of the seedling planting part 4, and a work operation lever 16 operating on-off of the hydraulic valve V supplying the hydraulic oil to a lifting lowering actuator 46 lifting and lowering the seedling planting part 4 and actuation of the seedling planting device 52, and operating lifting and lowering of the seedling planting part 4, wherein, as the hydraulic valve V is composed to switch to locked state when detecting, with an operation detecting means 16a detecting operation position of the work operation lever 16, the work operation lever 16 being operated to a neutral position, so the hydraulic oil is leaked from the hydraulic valve V, the lifting and lifting lowering actuator 46 is operated and the defect of lowering the seedling planting part 4 is prevented.COPYRIGHT: (C)2014,JPO&INPIT【課題】油圧バルブを閉じても、苗植付装置の油圧バルブ内から作動油が漏れ出し、昇降用油圧シリンダが少しずつ伸びて苗植付部が下降する不具合を防止した苗移植機を提供すること。【解決手段】苗を積載する苗植付部4を昇降自在に機体後部に設け、該苗植付部4の下部に圃場に苗を植え付ける苗植付装置52とけ、苗植付部4を昇降させる昇降アクチュエータ46に作動油を供給する油圧バルブVと該苗植付装置52の作動の入切及び前記苗植付部4の昇降を操作する作業操作レバー16を設けた苗移植機において、作業操作レバー16の操作位置を検出する操作検知手段16aにより作業操作レバー16が中立位置に操作されたことが検知されると、油圧バルブVをロック状態に切り替える構成としたことにより、油圧バルブVから作動油が漏れて昇降アクチュエータ46が作動して苗植付部4が下降する不具合を防止できる。【選択図】図4
