Humidifier

A humidifier comprising:

• a casing;
• an air passage in the casing;
• a humidifying section configured to humidify air flowing through the air passage;
• a tray configured to supply water to the humidifying section;
• a tank configured to supply water to the tray;
• a water supply port communicating with the tank, the water supply port being configured to supply water from outside into the tank;
• a door openable and closable, the door being a part of a side surface of the casing;
• and
• an overflow control mechanism configured to guide water flowing out of the water supply port to the tray,
• the water supply port
• being exposed to outside of the casing,
• being disposed inside the door,
• being provided in the tank, and
• shifting between
• a first position in which the water supply port is exposed to the outside of the casing when supplying the water, and
• a second position in which the water supply port is housed in the casing when supplying no water,
• the door being open in the first position, and closed in the second position,
• the tank being turnably supported by the casing, and
• the water supply port shifting between the first position and the second position when the tank turns.