15 assume that it is to be detected through observation with the water level indicator 41 that the water level of the water reservoir 34 is equal to or lower than a predetermined level and that the water reservoir 34 is to be replenished with water or that the humidifying mechanism 32 is to be cleaned in this such a case the operator inserts his finger into the recess 42 and holds the hanging portion 43 with his finger to pull out the front surface 38 from the support 71 since the front surface 38 the water reservoir 34 and the heating portion 35 are connected to each other and the heating portion 35 is not fixed to the main body 12 the entire portion of the humidifying mechanism 32 can be completely disconnected from the support 71 by only pulling out the front surface 38 in addition as is apparent from fig1 and 2 the boundaries between the bottom surface and the side surfaces of the water reservoir 34 and the boundaries between the side surfaces of the recess 57 of the metal body 56 form curved surfaces having a particularly large radius of curvature accordingly the entire portion of the humidifying mechanism 32 particularly the water reservoir 34 and the recess 57 of the metal body 56 that come into direct contact with water can be cleaned easily facilitating maintenance as is apparent from fig3 since the bottom surface of the water reservoir 34 is deeper than the bottom.