PROBLEM TO BE SOLVED: To provide an air cleaning device reliably transporting electrolysis water generated in an electrolysis water passage to a filter member.SOLUTION: The air cleaning device includes a water supply passage 42 guiding water in a water supply tank 20 to a filter member 60, and an electrolysis water passage 42d electrolyzing the water. The water supply passage 42 comprises a first upstream side water supply passage 42e, a first downstream side water supply passage 42f, an electrolysis water passage 42d and a second water supply passage 42b. The bottom surface of the first downstream side water supply passage 42f is lower than the bottom surface of the first upstream side water supply passage 42e. The bottom surface of the electrolysis water passage 42d is lower than the bottom surface of the first downstream side water supply passage 42f. The bottom surface of the second water supply passage 42b is higher than the bottom surface of the first downstream side water supply passage 42f and the bottom surface of the electrolysis water supply passage 42d.
