To rationally compose a rice transplanter good in efficiency without deteriorating the effectiveness of carrying out the lifting and lowering of a seedling planting device interlockingly with steering operations of front wheels.

This paddy field working machine is equipped with a restricting means for carrying out the interlocking lifting control for starting the lifting of the seedling planting device A as a ground working device arranged so as to freely lift and lower by a driving force of an actuator when the steering angle of the front wheels 1 attains a lifting starting angle in a state in which the automatic lifting and lowering control for maintaining the posture of a ground contact float 24S at a target posture is performed and stopping the lifting when the ground contact float 24S attains the preset angle by the lifting.