The objective of the present invention is to promote a simplified configuration or improvement of assembly. A riding-type paddy field work machine of the present invention comprises a riding-type driving vehicle body (1)； a main operational equipment (15) for seeding or rice-planting； a fertilization equipment (16) for supplying a fertilizer to a package； a reagent equipment (17) for supplying drugs to the package, wherein the main operational equipment (15), the fertilization equipment (16), and the reagent equipment (17) are unitized as an operational unit (A) and connected to a rear portion of the driving vehicle body (1) as being able to ascend and descend through a vertical fluctuation type of link equipment (3)； and the operational unit (A) for arranging a fertilization reservoir (28), which is provided with the fertilization equipment (16), in a side of a front portion thereof, arranging a main reservoir (24) for seeding or planting which is provided with the main operational equipment (15), at a side of a rear portion of the operational unit, and arranging a drug reservoir (33) which is provided with the reagent equipment (17) between the main reservoir (24) and the fertilization reservoir (28).
