AN OBJECT OF THE PRESENT INVENTION IS TO PROVIDE A SEEDLING TRANSPLANTER WITH A SEEDLING TRAY THE MAINTENANCE OF WHICH IS READILY CARRIED OUT, DESPITE ITS INTRICATE SEEDLING CONVEYER OR SEEDLING PLANTING DEVICE. [SOLUTION] A SEEDLING TRANSPLANTER INCLUDES: A VEHICLE； A LIFT LINK DEVICE； AND A PLANTING UNIT MOUNTED ON THE VEHICLE THROUGH THE LIFT LINK DEVICE, THE PLANTING UNIT INCLUDING: A TRANSMISSION CASE； A SEEDLING TRAY (80) FOR LOADING A SEEDLING； A HORIZONTAL FRAME (81) TRANSVERSELY MOUNTED BELOW THE SEEDLING TRAY (80)； A SEEDLING CONVEYER FOR FORWARDING THE SEEDLING LOADED ON THE SEEDLING TRAY (80)； AND A LEAD CAM FOR TRANSVERSELY MOVING THE SEEDLING TRAY (80)； WHEREIN A HOLDING MECHANISM (40) FOR ENGAGING THE SEEDLING TRAY (80) AND THE LEAD CAM IS MOUNTED； THE HOLDING MECHANISM (40) INCLUDES A LIFT GUIDE (43), HAVING A MOVEMENT GROOVE FORMED THEREIN, AND A LIFT SUPPORT SHAFT (46) MOVABLY MOUNTED INSIDE THE MOVEMENT GROOVE； AND THE LIFT SUPPORT SHAFT (46) IS FIXED TO THE SEEDLING TRAY (80). FIG. 5
