PROBLEM TO BE SOLVED: To provide a planting portion of a rice transplanter, which has an improved assembling property, controls a manufacture cost, and realizes necessary and sufficient durability and a light weight. SOLUTION: A fixing member for fixing a sun gear in a rotary case of the planting portion of the rice transplanter, which is fixed to a planting case involving a transmission mechanism for transmitting a power to a planting arm shaft and has at least fixing pawls fit to the sun gear to control the rotation and setting means for setting the fixing member to the planting case, is characterized by forming the fixing member in a linear symmetry to symmetrically dispose the fixing pawls and the setting means on the symmetrical line.
