To provide a centrifugal blower (1) in which an impeller (2) can be assembled from a side of a scroll housing (17) opposite to a suction port (22) and which improves separability between wet air and dry outside air.SOLUTION: In the impeller (2) of the centrifugal blower (1), a radially outside edge (5e) of a first blade (5) is positioned inside of a wall edge (20e) of a partition wall (20) facing the impeller (2). Radially outside edges (7z and 107z) of dividing members (7 and 107) dividing a space between the multiple first blades (5) of the impeller (2) and a space between multiple second blades (6 and 106) are positioned outside of the wall edge (20e) of the partition wall (20) and closer to the other end in an axial direction than the wall edge (20e).SELECTED DRAWING: Figure 1
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