A humidifier according to an embodiment of the present disclosure includes: a case; a base disposed below the case; a base cover which is disposed above the base, and to which the case is removably coupled; a humidifying assembly disposed in the case and configured to generate mist, a filter disposed below the humidifying assembly; and a sterilization module disposed on the base cover and configured to emit ultraviolet light, wherein in response to the case being coupled to the base cover and the filter being seated, the sterilization module is configured to emit ultraviolet light to an inner hollow of the filter, thereby preventing a safety accident, and controlling hygiene in the humidifier.