PROBLEM TO BE SOLVED: To provide a seedling transplanter which can surely detect the hardness or softness of a field, can accurately control the planting height of a seedling-planting portion, and can thereby plant seedlings in high accuracy.SOLUTION: A seedling transplanter in which a seedling planting portion 6 is liftably connected to the rear side of a travel vehicle body 1, and the planting height of the seedling planting portion 6 with respect to the vehicle body 1 is upward or downward controlled by the attack angle swinging of a float 2 disposed on the lower portion of the seedling planting portion 6 to keep the seedling-planting depth approximately constant, is provided with a sensitivity-setting device 7 for setting the sensitivity of lifting or lowering control to highly insensitive or less sensitive, and a first sensor 8 and second sensor 9 as a plurality of hardness or softness sensors 10 used for detecting the hardness or softness degree of soil and having different detection characteristics, and can correct the control sensitivity of lifting or lowering control by the detection of the first sensor 8 or the second sensor 9 selected corresponding to the control sensitivity of the lifting or lowering control.COPYRIGHT: (C)2014,JPO&INPIT【課題】圃場の硬軟を確実に検出し、苗植付部の植付高さを的確に制御することにより、苗を高精度で植え付けることのできる苗移植機を提供する。【解決手段】走行車体1の後側に苗植付部6を昇降自在に連結し、苗植付部6の下部に設けるフロート2の迎い角揺動によって車体1に対する苗植付部6の植付高さを昇降制御して苗植付深さを略一定に維持する苗移植機において、昇降制御の感度を鈍感、敏感に設定する感度設定器7と、土壌の硬軟度を検出する検出特性を異にする複数の硬軟センサ10として第1センサ8と第2センサ9を設け、昇降制御の制御感度に対応して選択された第1センサ8または第2センサ9の検出により、昇降制御の制御感度を補正可能に設けて構成する。【選択図】図3
