Provided is a rice transplanter which equalizes torque variation by applying a torque variation having the opposite phase of the torque variation occurring in a planting arm shaft and ameliorates phase shift, thereby optimizing the trajectory of planting claws to prevent errors in planting. This rice transplanter transmits power via a nonuniform speed mechanism to the planting arm shaft which supports a rotary case, wherein, inside of the planting chain case, the planting arm shaft is driven by intermediary of a chain. Inside of the planting chain case, a torque equalizing mechanism is provided which applies torque to cancel out the torque variation occurring due to the nonuniform speed mechanism, and said torque equalizing mechanism is attached to a sprocket driving said chain.
