PROBLEM TO BE SOLVED: To provide a sulky rice transplanter improved in seedling planting accuracy for favorable seedling planting even in climbing slope planting operations. SOLUTION: The subject lift control structure has an automatic lift control means having the function to control the vertical movement of a seedling planting device 3 so that the swing posture of a sensor float 14S is restored within an acceptable margin of the preset standard posture relative to the seedling planting device 3, a means Sc for detecting the angle of inclination of a traveling machine body 1 in its longitudinal direction, and a correction means for correcting the standard posture of the sensor float 14S toward a front downward direction as the angle of inclination runs greater toward a front upward direction; wherein the correction means is actuated when the angle of inclination comes to a value in a front upward direction in excess of a 1st set value (a) set in advance, while the correction means is halted when the angle of inclination comes to a value in a front upward direction smaller than a 2nd set value b set in advance; by the way, the 1st set value (a) to be set is greater than the 2nd set value b.
