The invention relates to a riding type rice planting machine. A connection base part of a feeding box disposed on an upper part of a square tubular main frame is screwed up by a connection bolt and is connected on the main frame, and the connection state is not easy loose. The connection bolt (42) runs through the upper part (22u) and a lower part (22d) of the main frame (22) in a vertical direction of a frame of the rice planting machine. The connection base part (40) is screwed up by the connection bolt (42) and connected onto the main frame (22).
