One type of dryer, namely a laundry dryer (1), comprises a water tank (20) and a drum (30). At the time of drying laundry, the interior of the drum (30) functions as a hermetically closed drying chamber (170). The air in the closed drying chamber (170) is sucked into a circulation duct (171) and heated by means of a heater (173) to a hot air before being blown into the closed drying chamber (170). The hot air having absorbed moisture from the laundry comes into contact with dehumidification water in a cooling chamber (174) within the circulation duct (171), thereby being dehumidified. The dehumidification water is sprayed by a mist generator (180). In the drying process, the mist generator (180) generates mist of metal ion water which has passed through an ion dissolving unit (100) and sprays the mist to the laundry.