The utility model discloses an operation machine in paddy field can transmit the round swing of drive division to an one way clutch and the 2nd one way clutch high -efficiently. The operation machine in paddy field comes and goes swing drive via joining part (49) to drive division (46) through coming and going the swing drive to swinging member (four to six -tenehs 1) at the within range of regulation angle (A1) by transmission shaft (22) to have and join position change unit (61a, 62), freely change swinging member (61) binding position for transmission shaft (22) along the rotary direction of transmission shaft (22). Swing to regulation orientation (B1) a swing drives one way clutch (41) through the past journey of drive division (46) to carry out swing drives to drive shaft (37) to regulation direction (B1). Swing to regulation orientation (B1) the 2nd one way clutch of swing drives (42) through the back tracking of drive division (46) to carry out swing drives to drive shaft (37) to regulation direction (B1).
