The invention provides a paddy field working machine which can fully guarantee the carrying wind quantity of a blower. The paddy field working machine comprises a powder supply device used for supplying powder to farmland. The powder supply device comprises: a blower (35) used for generating carrying wind; a guide unit carrying and guiding powder via the carrying wind; a suction guide pipe (C) providing carrying air for a suction unit of the blower (35) at another position different from a mounting position of the blower of a running vehicle body, wherein the air flow direction of the suction guide pipe (C) intersects with the suction direction of the suction unit. The connecting portion of the suction guide pipe (C) and the suction unit is provided with an expansion unit (H) which enables an air flow space for the flow of the carrying air to expand towards the position different from the suction guide pipe (C).
