PROBLEM TO BE SOLVED: To provide a lift structure for a seedling planting device of a rice planting machine capable of bringing the seedling planting device not to interfere with a levee or the like when a drive transmission is changed to a reverse side and bringing a row adjusting work at the beginning of the planting work to be easier. SOLUTION: The seedling planting device 3 is automatically raised when a transmission 10 is changed to a reverse condition. When the seedling planting device 3 is in a raised state, the position for a reverse operation is selected and a lifting switch is operated to descend, the seedling planting device 3 goes down to a state capable of easily carrying out a row adjusting work.