To provide a cleaning apparatus constituted so as to certainly remove a sand component with a predetermined particle size or above, to achieve a decrease in cost by reducing the replacing frequency of a filter membrane such as a hollow fiber membrane or the like and suppressing the power consumption of a raw water pump and to hold a high raw water treatment capacity to perform an efficient operation.

In the cleaning apparatus constituted so as to supply raw water 2 to a membrane filter module 6 to remove bacteria or protozoans in the raw water 2, a cyclone 5 for removing the solid components in the raw water 2 is provided on the upstream side in the flow direction of the raw water 2 of the membrane filter module 6.