TO PROVIDE A SEEDLING TRANSPLANTER FOR FEEDING A LUBRICANT TO ALL OVER A GUIDE SHAFT AND SMOOTHING TRANSVERSE MOVEMENT OF A SEEDLING TRAY.[SOLUTION] A SEEDLING TRANSPLANTER IS CONFIGURED TO COMPRISE: A TRANSVERSELY RECIPROCALLY MOVABLE SEEDLING TRAY； A PLANTING DEVICE FOR EXTRACTING A SEEDLING FROM THE SEEDLING TRAY TO PLANT IN A FARM FIELD； A GUIDE SHAFT (37) INCLUDING A HELICAL GROOVE (38) FORMED THEREIN； AND A SLIDER (39) INCLUDING INSIDE THEREOF A GUIDE BOSS (40) FOR MAKING CONTACT WITH THE GROOVE IN THE GUIDE SHAFT (37),THE SLIDER (39) FOR SLIDING, WHEN THE GUIDE SHAFT (37) IS TURNED, TO TRANSVERSELY MOVE THE SEEDLING TRAY BACK AND FORTH； EXPANDABLE AND CONTRACTIBLE COVERING MEMBERS (42, 42) FOR FEEDING A LUBRICANT INTO THE INSIDES THEREOF ARE RESPECTIVELY FORMED ON BOTH TRANSVERSE SIDES OF THE SLIDER (39) AND ON THE CIRCUMFERENCE OF THE GUIDE SHAFT (37) AND THE INSIDES OF THE COVERING MEMBERS (42, 42) ARE CONNECTED VIA A CIRCULATION PATH (43).
