A humidifier includes a first humidifying water tank which heats water; and an electrical equipment unit electrically connected to the first humidifying water tank, wherein the first humidifying tank includes a heater which is disposed in a lower portion of the first humidifying water tank, and heats water, wherein the electrical equipment unit includes: a first substrate which supplies power to the heater; and a control box which accommodates the first substrate, and is electrically connected to a power cord and the heater, respectively.