To provide a humidifier which can get humidification being safe on health to the user by suppressing the influence of various germs breeding in a humidifying element, and to provide an air conditioner fitted with this humidifier.

In the humidifier, which has a humidifying means 210 for humidifying air by supplied city water, a hypochlorous acid generation means 230 which generates hypochlorous acid, using the city water and gives it into the city water, is provided. This hypochlorous acid generation means 230 refers to an electrolytic vessel 230, which is arranged within a supply pipe 220 for supplying the humidifying means 210 with city water. Or the humidifying means 210 is constituted of a plurality of metallic members 210 not in contact with one another, and a noncontact part 210b is provided with a specified interval, where a water screen of city water is to be made, and voltage is applied between the adjacent metallic members 210a. Furthermore, it will do to integrate this humidifier into an air conditioner and use it.