PURPOSE:To enable a furrower to relatively readily change position thereof for transplanted seedlings, by mounting a float with a furrower on a supporting shaft provided in the right and left direction of a machine body and enabling the supporting shaft to slide in the shaft center direction. CONSTITUTION:A supporting shaft 17 is laid on brackets 16 provided on the undersurface of a planting mission in the right and left direction of a seedling planter and supported on the shaft itself slidably in the shaft direction and rotatably on the shaft thereof. Floats 6 are attached rockingly on the horizontal shaft center (P1) at the ends of supporting arms 18 and furrowers 10 are fixed to the floats 6. A gripping part 23 at the end of the supporting shaft is held to slide the floats 6 together with the supporting shaft 17 in the shaft direction and the positioning of the furrowers 10 for the planted seedlings (W) is carried out.
