The purpose of the present invention is to provide a rice transplanter which detects the rising and falling of a float to correct the sensitivity of the raising and lowering control of a planting unit and which can maintain planting accuracy. This rice transplanter is provided with a float which detects the ground plane of an agricultural field a sensor which is swingably supported by the planting unit and which follows the ground plane of the agricultural field and a sensitivity adjustment lever which changes the sensitivity with which the inclination of the float is detected wherein the sensitivity adjustment lever is rotated in a prescribed input direction on the basis of swinging of the sensor.
