WATER PURIFIER

PROBLEM TO BE SOLVED: To provide a water purifier capable of making known visually to a user about the finish timing of back washing in a filter element.SOLUTION: A water purifier is provided with a casing, a filter tank housing a hollow yarn filter and disposed in the casing, a cleaning flow path 112, a bladed wheel 150 and a rotation part 180 on which a display label 174 is attached. The water to be used for cleaning the filter tank is circulated through the cleaning flow path 112 by circulating water through the hollow yarn filter to the direction reverse to that circulating through the filter when filtering the water. The bladed wheel 150 rotates on the basis of the flow rate of the water flowing in the cleaning flow path 112, and the rotation part 180 rotates by receiving the rotation of the bladed wheel 150. The display label 174 displays the flow rate of the water passing through the hollow yarn filter 121 in response to the rotation of the rotation part 180.