To provide a method for washing a seasoning liquid spray nozzle in a short time and maintaining an effect of uniformly spraying a seasoning liquid in a set amount for a long period of time. A washing liquid supply pipe L5 for supplying a washing liquid is connected to a seasoning liquid supply pipe L1 for connecting the seasoning liquid pressurized by the seasoning liquid pump P1 to the seasoning liquid spray nozzle 41. A washing liquid switching valve V3 is disposed at a connection part where the seasoning liquid supply pipe L1 and the washing liquid supply pipe L5 are connected. In a state where the washing liquid switching valve V3 is switched to the seasoning liquid supply position, the seasoning liquid spray nozzle 41 outputs the seasoning liquid pressurized by the seasoning liquid pump P1, and in a state where the washing liquid switching valve V3 is switched...

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