The up-and-down control of a rice transplanter is installed with an altitude sensor to detect the up-and-down altitude of a vehicle body leaving from a cultivated land surface, or a transverse shaking control of the rice transplanter to detect the inclination in the left-and-right directions. Although the generally-known inclining sensor is composed of a simple pendulum, an adjustment for the accuracy or sensitivity in detecting the inclination is difficult and the control constitution is also complicated. The invented rice transplanter includes a transverse shaking actuator (17) to control the left-and-right inclination of the machine body by changing the relative height of the vehicle wheel (10) in left-and-right, and a young plant planting funnel (3) that can be moved up-and-down at left-and-right of the young plant planted in the farmland, which is characterized in that: installing left side and the right side suppression utensils (4), which are capable of moving up-and-down to suppress left-and-right of the planting position of each young plant according to left-and-right of the young plant planting funnel (3) installing left side and the right side sensing arms (47) that are spaced and linking-up separately with the up-and-down movement of left-and-right suppression utensils (4) and installing a posture control device in the vehicle body of the rice transplanter that is capable of detecting the inclination of the machine body by variation of the interval of left-and-right of the sensing arms (47) to move the transverse shaking actuator (17).
