A centrifugal blower includes a case, an electric motor supported by the case at a motor support position, and a fan driven by the electric motor. The fan includes: a boss installed to an output shaft; a main plate extending outward from the boss in a radial direction; a plurality of blades extending from the main plate toward one side in an axial direction; and a side plate joined to an end portion of each of the plurality of blades, which faces the one side in the axial direction. A weight of the main plate is larger than a weight of the side plate. The main plate and the side plate are both inclined toward another side opposite to the one side in the axial direction as the main plate and the side plate approach an outer side in the radial direction.