PROBLEM TO BE SOLVED: To constitute an agricultural material supply device with a plurality of drippers for supplying agricultural materials in a paddy so that the agricultural materials are properly supplied in the paddy from the plurality of drippers.SOLUTION: An agricultural material supply device includes a tank 25, a pump 26 for feeding agricultural materials from the tank 25, and a supply pipe 27 where the agricultural materials from the pump 26 are supplied. The device includes drippers 28 that open when the pressure of the agricultural materials rises beyond a set pressure and close when the pressure of the agricultural materials declines beyond the set pressure, and thereby supply the agricultural materials in the paddy. The device includes a plurality of branching parts 27d, 27e branched off from the supply pipe 27 and connected to the drippers 28 so as to be compatible with each of the drippers 28. The device includes a return part 40 provided with a plurality of relief valves 39 in parallel at the
