PROBLEM TO BE SOLVED: To provide a rice transplanter capable of preventing a mud push in a sensitive state of a planting depth sensor and capable of improving a ground leveling effect of a float in an insensitive state of the planting depth sensor, by a simple configuration.SOLUTION: A rice transplanter 100 adjusts ascent and descent positions of a planting part 40 for planting a seedling in a farm field by rotating a planting depth sensor 60 for detecting the planting depth of the farm field, and a valve arm 65. The rice transplanter includes a sensitivity adjusting mechanism 80 for urging the valve arm 65 in a rotational direction in which the planting part 40 descends, when sensitivity of the planting depth sensor 60 is lower than predetermined sensitivity.COPYRIGHT: (C)2015,JPO&INPIT【課題】簡易な構成にて、植深センサが敏感の場合には、泥おしを防止でき、植深センサが鈍感の場合には、フロートの整地効果を向上させることができる田植機を提供する。【解決手段】圃場の植付深さを検出する植深センサ60と、バルブアーム65を回動させ苗株を圃場に植え付ける植付部40の昇降位置を調整する田植機100であって、植深センサ60の感度が所定感度より鈍感の場合には、バルブアーム65を、植付部40が下降する回動方向に付勢する感度調整機構80を備える。【選択図】図3
