PROBLEM TO BE SOLVED: To provide a seedling transplanter designed not to damage a field during operation in the field etc., with a high turning frequency when a marker automatic ON-OFF device 8 is changed into an inoperative state.SOLUTION: The seedling transplanter includes a marker automatic changeover device 7 for automatically changing over a line drawing marker 6 to be an operative state in operative connection to the turning of a car body 2 to either of right and left the marker automatic ON-OFF device 8 for changing over the marker automatic changeover device 7 to an operative state and the inoperative state and an intermittent ON-OFF control function B1 for intermittently turning ON and OFF the driving of rear wheels 11 on the steering inside in the operative connection to steering operation of a steering wheel 34. The intermittent ON-OFF control function B1 increases the ratio of the ON state of period for turning ON/OFF the driving of the rear wheels 11 on the steering inside from that of the ON state of the period for turning ON/OFF the driving of the rear wheels 11 on the steering inside preset during usual turning, when the marker automatic ON-OFF device 8 is changeovered to the inoperative state.COPYRIGHT: (C)2010,JPO&INPIT【課題】マーカ自動入切装置8を非作動状態にしたとき、旋回頻度が高い圃場などで作業中に圃場を荒らさないようにした苗移植機を提供すること。【解決手段】車体2の旋回に連動して作用状態となる線引きマーカ6を左右何れかに自動的に切り替えるマーカ自動切替装置7と該マーカ自動切替装置7を作動状態と非作動状態とに切り替えるマーカ自動入切装置8とハンドル34の操向操作に連動して操向内側の後輪11の駆動を断続的に入り切りする断続的入り切り制御機能B1とを備え、該断続的入り切り制御機能B1は、マーカ自動入切装置8を非作動状態に切り替えたとき、操向内側の後輪11の駆動を入/切する周期の入状態の割合を通常の旋回時に予め設定している操向内側の後輪11の駆動を入/切する周期の入状態の割合より大きくする構成とした。【選択図】図7
