and humidity of the discharged air in the present embodiment water cooling and air cooling are combined for a more effective regulation of the temperature and the humidity of the discharged water vapor of course water cooling may only be employed in detail there is a water cooling valve 60 at a top of the air discharge duct 40 for selective regulation of water supply of course it is preferable that the water cooling valve 60 is connected to the water supply valve 10 though the water cooling valve 60 may be connected to the air discharge duct 40 directly it is preferable that a separate water cooling duct 62 is provided and the water cooling valve 60 is connected to the water cooling duct 62 that is one end of the water cooling duct 62 is connected to a lower part of the outer tub and the other end of the water cooling duct 62 is connected to the air discharge duct 40 it is more preferable that a filter 70 is fitted to a connection part of the air discharge duct 40 and the water cooling duct 62 in the meantime it is preferable that a fan 22 a is fitted to the air discharge duct 40 for smooth discharge of water vapor if the circulation duct 20 is directly connected to the drain duct 11 the same as this embodiment no fan may be fitted to the circulation duct 20 because the air in the inner tub can be circulated through the circulation duct 20 even if the fan 22.