To easily and appropriately sterilize by improving a conveyor installed in continuous washing apparatus.

An X axis shows a feeding direction of the conveyor 3, and a Y axis shows a width direction of the conveyor in the figure. A plural number of nozzles 9 are arranged in parallel with the Y axis. A disinfectant solution in a disinfectant solution tank 11 is forcibly fed into a disinfectant solution pipe 8 by a pump 10 and is sprayed to the conveyor 3 from the nozzles 9. An automatic control device 13 recognizes the operation state of the conveyor 3 from the operation status of a conveyor motor 6 and activates a pump motor 12 in accordance with the operation state of the conveyor.