One end of a humidify element 12 which has a plurality of humidify segments 24 connected to be free to extend and contract is fixed to a first case portion 28. One end of another humidify element 12 having the same structure is fixed to a second case portion 30. Each other end of the two humidify elements 12 is connected by a connect member 48. An inner space 42 as a water reservoir is formed at the first case portion 28 and the second case portion 30. At the time of non-usage, the first case portion 28 and the second case portion 30 are closed, and the humidify elements 12 and the connect member 48 are stored in the inner space 42. At the time of usage, the first case portion 28 and the second case portion 30 are opened, and the humidify elements 12 are extended. By supplying water to the inner space 42, one end of the plurality of humidify segments 24 is soaked in the water, and the whole humidify element 12 is moistened by capillary.