PROBLEM TO BE SOLVED: To provide a paddy working machine that is configured to effectively obtain efficacy while reducing an amount of spraying chemicals, and then to prevent the reduction of a budding rate and a seedling establishment rate due to seed penetration or the seedling fall due to planting failure.SOLUTION: A paddy working machine includes a main working device, a fertilizing device and a chemical-spraying device for use in seeding or seedling planting operating in the forward traveling for work. The main working device includes multiple main supply parts 26 for supplying seed or seedling in the field that are aligned and arranged at regular intervals in the lateral direction. The fertilizing device is disposed of multiple fertilizer supply parts 31 for supplying fertilizer in the field, in a position at the front side of a machine body from the multiple main supply parts 26, and in a position spaced at predetermined intervals from the corresponding main supply part 26 to the machine body width direction. The chemical-spraying device is disposed of multiple chemical-supplying parts 36 constituted in a grooving type for grooving on a mud surface of the field by a grooving unit 37 for spraying chemicals and supplying chemicals in a groove, in a position at the front side of the machine body from the multiple fertilizer supply parts 31 and in the same position with the corresponding main supply part 26 in the machine body width direction.
